Every four years something funny happens with our calendars -- we add a day! Why do we do this? Discover the science behind leap year.

Why do some objects make loud sounds when dropped, while others make quiet sounds?

Can your child tell what will be attracted by a magnet? Challenge him to think about why magnets attract certain objects.

Magnets are fun to play with, but how do they actually work? Have your child circle the objects he thinks the magnet will attract.