The giant hornet Vespa Mandarina Japonica preys on Japanese bees. However, if one of the hornets attempts to invade the bee hive, several hundreds of the bees quickly form a compact ball around the hornet to stop it. After 20 minutes the hornet is dead, though the bees do not sting, bite, crush or suffocate it. How ??
This is because the bee ball generates sufficient heat energy to kill the hornet given their large volume-surface ratio and heat the hornet to death.
The force exerted by water on the body of a descending diver increases noticeably, even for a relatively shallow descent to the bottom of a swimming pool. Amateur divers often face the great risk due to this water pressure. How ??
The fact is that below the water surface the lung air pressure is equilibrated with that of the water at that depth. If the diver does not gradually exhale while ascending to the surface, he will arrive at the surface with surplus air pressure which may rupture his lungs and cause cardiac arrest due to air embolism. If the diver follows instructions and gradually exhales as he ascends, he allows the pressure in his lungs to equalize with the external pressure and then there is no danger.
Moderation Team
![[Post New]](/templates/default/images/icon_minipost_new.gif){kind=icon}
![[Up]](/templates/default/images/icon_up.gif "[Up]"){kind=icon}
89
.gif)
.gif)
.gif)
