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Researchers tested the cortisol levels of workers during the workday and on weekends and found the cortisol levels lower when the person was at work than when he or she was home.

The fact that stress levels go down when people are at work may indicate that there is something at work that i...

• Broader categories are always more probable than their subsets. It's more likely someone has a pet than they have a cat. It's more likely someone likes coffee than they like cappuccinos. The extension rule in probability theory thus states that if B is a subset of A, B cannot ...

It is significantly cheaper to charge an electrical car than to fill up a tank. The cost depends on the electricity tariff you're covered by, but most manufacturers will suggest that you switch to an Economy 7 tariff to pay less for electricity during the night.

The estimated average cost ...