If blueberries sink to the bottom, that means they are more dense and have a higher sugar content, meaning they will taste the best eaten fresh. These blueberries likely had more adequate sunlight ...

A fresh egg will sink. The egg that floated was from a carton of eggs that one of Letterman's staff members had in his fridge, and the "sell-by" date was Jan. 10.

If you find yourself eating extra fiber and noticing your poop is starting to float, cut back on these high-fiber foods, and your poop will likely start to sink again, Dr. Ahmad says.

• As long as they have been refrigerated at 40°F or below, expired eggs are safe to eat past the "best by" date on the carton ...

How long do eggs stay fresh? Most egg cartons sold in stores get stamped with a "best if used by" or "best before" date for stores to control and rotate inventory.

Build literacy skills while making predictions with this sink-or-float activity. It's fun to learn about new concepts in a hands-on way. This family does just that with a sink-or-float activity ...

If you find yourself eating extra fiber and noticing your poop is starting to float, cut back on these high-fiber foods, and your poop will likely start to sink again, Dr. Ahmad says.