Tail-Wagging Birds
A listener asks: Why do some birds bob their tails up and down?
Why Is It?
Sunscreen Timing
A listener asks: how long should you wait after applying sunscreen before going outside?
Plant Budding
A change in temperature and day length signal plants to form buds in the spring.
Sizing Up Dogs II
A listener asks whether it's true that large dogs don't live as long as small dogs.
Sizing Up Dogs I
A listener asks whether large dogs are more intelligent than small dogs.
Scanning Memories
Researchers can distinguish between different memories using a brain scan.
Gelatin Source
Reality Check investigates the urban legend that gelatin is made from cow hooves.
Changing Hail
A listener asks if hail changes size as it falls to the ground.