Whether or not masks can protect against invading or escaping bugs depends on the type of mask and material.
The internet conspiracists are half right: most lights we have inside do emit UV, but not enough to harm us.
The umbilical cord drops off a baby's belly button after birth. What happens on the inside is far more fascinating.
There are a few reasons why smartphones, tablets and PCs start to seem less snappy over time.
Chicken eyes are stranger than you think: they can look up and down at the same time.
A reader wants to know why our noses run just because it's cold.
Why is it the flu virus is so deadly compared to the common cold virus?