Apples float in water, because 25% of their volume is made of air.

Forget Something? Because their memories were getting so bad with old age, Sadie and Sam had to put things in writing to help them remember them. One night, Sam got up from watching the usual TV soap and said to Sadie, "I’m going to the kitchen for something to eat. Do you want anything while I`m there?" Sadie said, "Yes, Sam, some ice cream, please." Just as Sam set off she added, "And write it down." "Don’t worry, I can remember ice cream," said Sam. Then Sadie said, "I also want strawberries on my ice cream... Write it down." "No need, I can remember ice cream with strawberries," he replied. Sadie added, "But I also want whipped cream on top of the strawberries." Sam nodded, but left the room without writing anything down. When he returned, Sam was carrying a plate of cold roast beef with mustard. "Now see what you`ve done," she said, "You’ve forgotten the toast I asked for."