Blood Donor Bonus
Giving blood can make you feel good about yourself. But could it be good for you, too?
Why Is It?
Salmon Harvest
A listener asks: Why don't we eat salmon after they spawn, to help conserve them?
Giraffe Stroke
Giraffes have big-time blood pressure to get blood to their heads. So why don't they burst a blood …
Dimpled Cars
A listener asks: Would the dimples on a golf ball also speed up a car or an airplane?
Polygraph Tests
Lie detector tests are used widely in law enforcement and even in some high-security workplaces. But …
Changing Physics
A listener asks: Was physics different when the universe was young?
Kids and Caffeine
Could kids suffer from caffeine withdrawal, just like adults?
Caffeine Withdrawal
A listener asks: Why do I get a headache if I go without coffee?