New research finds that keeping a secret can make you feel as if you are physically burdened. Christie Nicholson reports

The anterior cerebral artery widens just before brain freeze, sending warming blood to the brain but increasing the pressure to painful levels. Katherine Harmon reports

A forthcoming study finds that keeping busy with selfless tasks greatly expands our perception of how much time we have. Christie Nicholson reports

Fast food chains say it's hard to hold the salt, but outlets in other countries are already cutting back on sodium. Katherine Harmon reports

Research finds that men are perceived to be strong and large if they are carrying a deadly weapon. Christie Nicholson reports

Women who wish to conceive later in life have benefited from improvements in reproductive technology. But even those have expiration dates. Katherine Harmon reports

New research has found significant discrepancies between how much people think they weigh and how much they actually weigh. Christie Nicholson reports

Boys get more outside playtime than girls, and almost half of parents do not take their preschool-aged kids out to play once a day. Katherine Harmon reports

People who ate chocolate frequently consumed more calories and more saturated fat, yet had lower average body mass indexes than those who did not eat chocolate. Katherine Harmon reports

Researchers find that how soon we sleep after learning new information impacts how well we retain it. Christie Nicholson reports