Hockey Puck - Deepstash
Productivity Systems

Learn more about scienceandnature with this collection

How to set achievable goals

How to create and stick to a schedule

How to break down large projects into smaller manageable tasks

Productivity Systems

Discover 46 similar ideas in

It takes just

13 mins to read

Hockey Puck

Hockey Puck

Q. How hard would a puck have to be shot to be able to knock the goalie himself backward into the net?

  • This can’t really happen.
  • If you’re like me, when you first saw this question, you might’ve imagined the puck leaving a cartoon-style hockey-puck-shaped hole. But that’s because our intuitions are shaky about how materials react at very high speeds.
  • Instead, a different mental picture might be more accurate: Imagine throwing a ripe tomato—as hard as you can—at a cake. That’s about what would happen.

86

380 reads

MORE IDEAS ON THIS

Falling with Helium

Falling with Helium

Q. What if I jumped out of an airplane with a couple of tanks of helium and one huge, un-inflated balloon? Then, while falling, I release the helium and fill the balloon. How long of a fall would I need in order for the balloon to slow me enough that I could land safely?

  • If you inflate...

87

325 reads

Steak Drop

Steak Drop

Q. From what height would you need to drop a steak for it to be cooked when it hit the ground?

  • No matter how fast it was going when it reached the lower layers of the atmosphere, it would quickly slow down to terminal velocity. No matter the starting height, it always takes six or seve...

87

442 reads

No More DNA

No More DNA

Q. This may be a bit gruesome, but . . . if someone’s DNA suddenly vanished, how long would that person last?

  • If you lost your DNA, you would instantly be about a third of a pound lighter.
  • Losing your DNA would most likely result in abdominal pain, nausea, dizziness, rapid immu...

88

445 reads

Everybody Out

Everybody Out

Q. Is there enough energy to move the entire current human population off-planet?

  • An absolute baseline energy requirement: 4 gigajoules per person. No matter how we do it, whether we use rockets or a cannon or a space elevator or a ladder, moving a 65-kilogram person—out of the Earth’s...

87

344 reads

Stirring Tea

Stirring Tea

Q. I was absentmindedly stirring a cup of hot tea, when I got to thinking, “Aren’t I actually adding kinetic energy into this cup?” I know that stirring does help to cool down the tea, but what if I were to stir it faster? Would I be able to boil a cup of water by stirring?

  • No.

87

275 reads

Size Of Internet

Size Of Internet

Q. How much physical space does the Internet take up?

  • The storage industry produces in the neighborhood of 650 million hard drives per year. If most of them are 3.5-inch drives, that’s 8 liters (2 gallons) of hard drive per second.
  • This means the last few years of hard-drive pr...

92

733 reads

Raindrop

Raindrop

Q. What if a rainstorm dropped all of its water in a single giant drop?

  • In this storm, all that water instead condenses into one giant drop, a sphere of water over a kilometer in diameter.
  • The drop is now falling at 90 meters per second (200 mph).
  • When the water contact...

87

304 reads

Rising Steadily

Rising Steadily

Q. If you suddenly began rising steadily at 1 foot per second, how exactly would you die? Would you freeze or suffocate first? Or something else?

  • Above 8000 meters—above the tops of all but the highest mountains—the oxygen content in the air is too low to support human life. Near this ...

88

720 reads

Lethal Neutrinos

Lethal Neutrinos

Q. How close would you have to be to a supernova to get a lethal dose of neutrino radiation?

  • Neutrinos are ghostly particles that barely interact with the world at all. Look at your hand—there are about a trillion neutrinos from the Sun passing through it every second.
  • If you o...

87

277 reads

Spent Fuel Pool

Spent Fuel Pool

Q. What if I took a swim in a typical spent nuclear fuel pool? Would I need to dive to actually experience a fatal amount of radiation? How long could I stay safely at the surface?

  • You could probably survive treading water anywhere from 10 to 40 hours.
  • Spent fuel from nuclear r...

89

924 reads

Machine-Gun Jetpack

Machine-Gun Jetpack

Q. Is it possible to build a jetpack using downward-firing machine guns?

  • The principle here is pretty simple. If you fire a bullet forward, the recoil pushes you back. So if you fire downward, the recoil should push you up.
  • With enough machine guns, you could fly.

89

882 reads

Relativistic Baseball

Relativistic Baseball

Q. What would happen if you tried to hit a baseball pitched at 90 percent the speed of light?

  • It would, however, start to eat away at the surface, blasting tiny fragments of the ball in all directions. These fragments would be going so fast that when they hit air molecules, they would ...

92

1.12K reads

Self-Fertilization

Self-Fertilization

Q. I read about some researchers who were trying to produce sperm from bone marrow stem cells. If a woman were to have sperm cells made from her own stem cells and impregnate herself, what would be her relationship to her daughter?

  • A child from a parent who self-fertilized would be lik...

87

337 reads

Weightless Arrow

Weightless Arrow

Q. Assuming a zero-gravity environment with an atmosphere identical to Earth’s, how long would it take the friction of air to stop an arrow fired from a bow? Would it eventually come to a standstill and hover in midair?

  • The arrow would slow down quickly. Air resistance is proportional ...

87

272 reads

Drain the Oceans

Drain the Oceans

Q. How quickly would the oceans drain if a circular portal 10 meters in radius leading into space were created at the bottom of Challenger Deep, the deepest spot in the ocean? How would the Earth change as the water was being drained?

  • It would actually take hundreds of thousands of yea...

87

287 reads

Everybody Jump

Everybody Jump

Q. What would happen if everyone on Earth stood as close to each other as they could and jumped, everyone landing on the ground at the same instant?

  • It doesn’t really affect the planet. Earth outweighs us by a factor of over ten trillion. On average, we humans can vertically jump maybe...

93

942 reads

Lighting

Lighting

Q. How dangerous is it, really, to be in a pool during a thunderstorm?

  • Pretty dangerous. Water is conductive, but that’s not the biggest problem—the biggest problem is that if you’re swimming, your head is poking up from a large flat surface. But lightning striking the water near you w...

88

693 reads

Yoda

Yoda

Q. How much Force power can Yoda output?

  • Combining this with the X-wing mass and lift rate gives us our peak power output: That’s enough to power a block of suburban homes. It’s also equal to about 25 horsepower. At current electricity prices, Yoda would be worth about $2/hour.

88

311 reads

Bullet Vs Lightning

Bullet Vs Lightning

Q. What would happen if lightning struck a bullet in midair?

  • If it were sitting still, the current would quickly heat and melt the metal.
  • But since it would be moving along so quickly, it would exit the channel before it could be warmed by more than a few degrees. It would cont...

88

608 reads

Random Sneeze Call

Random Sneeze Call

Q. If you call a random phone number and say “God bless you,” what are the chances that the person who answers just sneezed?

  • It’s hard to find good numbers on this, but it’s probably about 1 in 40,000.
  • Before you pick up the phone, you should also keep in mind that there’s roug...

88

312 reads

Little Planet

Little Planet

Q. If an asteroid was very small but supermassive, could you really live on it like the Little Prince?

  • If the asteroid had a radius of 1.75 meters, then in order to have Earthlike gravity at the surface, it would need to have a mass of about 500 million tons. This is roughly equal to t...

87

505 reads

Human Computer

Human Computer

Q. How much computing power could we could achieve if the entire world population stopped whatever we are doing right now and started doing calculations?How would it compare to a modern-day computer or smartphone?

  • The processor in a mobile phone could do calculations about 70 times fas...

88

546 reads

Global Windstorm

Global Windstorm

Q. What would happen if the Earth and all terrestrial objects suddenly stopped spinning, but the atmosphere retained its velocity?

  • Nearly everyone would die.
  • At the equator, the Earth’s surface is moving at about 470 meters per second—relative to its axis. If the Earth stopped ...

96

1.42K reads

Facebook of the Dead

Facebook of the Dead

Q. When, if ever, will Facebook contain more profiles of dead people than of living ones?

  • Either the 2060s or the 2130s. There are not a lot of dead people on Facebook. The main reasons for this is that Facebook—and its users—are young. The average Facebook user has gotten older over t...

87

286 reads

SAT Guessing

SAT Guessing

Q. What if everyone who took the SAT guessed on every multiple-choice question? How many perfect scores would there be?

  • The probability of getting all 158 questions right is: That’s one in 27 quinquatrigintillion.
  • How certain is it? Well, if they each used a computer to take th...

87

297 reads

Speed Bump

Speed Bump

Q. How fast can you hit a speed bump while driving and live?

  • The two main things protecting you from bumps in the road are the tires and the suspension.
  • Cars generate lift. The air flowing around a car exerts all kinds of forces on it.
  • At the range of 150–300 mph, a typ...

87

288 reads

CURATED FROM

CURATED BY

prince_rahul

"A good curated idea should be like a girl's skirt; long enough to cover the subject and short enough to create interest."

Ready for the next level?

Read Like a Pro

stash-superman-illustration

Explore the World’s

Best Ideas

200,000+ ideas on pretty much any topic. Created by the smartest people around & well-organized so you can explore at will.

An Idea for Everything

Explore the biggest library of insights. And we've infused it with powerful filtering tools so you can easily find what you need.

Knowledge Library

Powerful Saving & Organizational Tools

Save ideas for later reading, for personalized stashes, or for remembering it later.

# Personal Growth

Take Your Ideas

Anywhere

Organize your ideas & listen on the go. And with Pro, there are no limits.

Listen on the go

Just press play and we take care of the words.

Never worry about spotty connections

No Internet access? No problem. Within the mobile app, all your ideas are available, even when offline.

Get Organized with Stashes

Ideas for your next work project? Quotes that inspire you? Put them in the right place so you never lose them.

Join

2 Million Stashers

4.8

5,740 Reviews

App Store

4.7

72,690 Reviews

Google Play

samz905

Don’t look further if you love learning new things. A refreshing concept that provides quick ideas for busy thought leaders.

Shankul Varada

Best app ever! You heard it right. This app has helped me get back on my quest to get things done while equipping myself with knowledge everyday.

Ashley Anthony

This app is LOADED with RELEVANT, HELPFUL, AND EDUCATIONAL material. It is creatively intellectual, yet minimal enough to not overstimulate and create a learning block. I am exceptionally impressed with this app!

Sean Green

Great interesting short snippets of informative articles. Highly recommended to anyone who loves information and lacks patience.

Giovanna Scalzone

Brilliant. It feels fresh and encouraging. So many interesting pieces of information that are just enough to absorb and apply. So happy I found this.

Jamyson Haug

Great for quick bits of information and interesting ideas around whatever topics you are interested in. Visually, it looks great as well.

Laetitia Berton

I have only been using it for a few days now, but I have found answers to questions I had never consciously formulated, or to problems I face everyday at work or at home. I wish I had found this earlier, highly recommended!

Ghazala Begum

Even five minutes a day will improve your thinking. I've come across new ideas and learnt to improve existing ways to become more motivated, confident and happier.

Read & Learn

20x Faster

without
deepstash

with
deepstash

with

deepstash

Access to 200,000+ ideas

Access to the mobile app

Unlimited idea saving & library

Unlimited history

Unlimited listening to ideas

Downloading & offline access

Personalized recommendations

FAQ

Claim Your Limited Offer

Get Deepstash Pro

Supercharge your mind with one idea per day

Enter your email and spend 1 minute every day to learn something new.

Email

I agree to receive email updates