What is an astronaut’s favorite part on a computer?

A database index is a data structure that improves the speed of data retrieval operations on a database table at the cost of additional writes and storage space to maintain the index data structure. Indexes are used to quickly locate data without having to search every row in a database table eve...

Black holes cannot be seen as they don't reflect any light.

The centre of black hole is called singularity - a point of infinite density i.e the space curvature extends to infinity.

1. Quiz yourself frequently on the material you read. 
2. Space out your studying and quizzes
3. Quiz yourself on different topics in each study session.
4. Ask yourself questions while you are reading.