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Why can people swallow food while standing on their heads?
Swallowing has nothing to do with gravity, you tongue literally pushes food into your throat when you swallow. Swallowing is the utilization of a muscle.
What does a spacecraft need to overcome?
it needs to overcome the gravity of the earth lol
What does Low specific gravity in urine mean?
You are dehydrated and you need to increase your fluid intake.
Why did birds evolve after reptiles?
Because they can generate their own body heat - reptiles cannot and need a warm environment
What happens if you swallow glue?
You Die
Why can you eat upside-down?
Humans don't need gravity to swallow, although, interestingly, birds (i.e. canaries) do.
Why can't NASA send birds into space on the space shuttle?
Birds require gravity to swallow. Only insignificant amounts of gravity are experienced in outer space, so the birds would not be able to swallow and would therefore starve1. Citations: 1: NASA Canaries, Braingle - http://www.braingle.com/brainteasers/teaser.php?id=2828;op=0;comm=1
Birds use what to eat with?
Most birds cannot swallow nor do they have teeth, so they lean backwards and let gravity pull their food downwards through their throat.
Why do bird need gravity to swallow?
gravity is a myth; an old wives tale; created by the government to keep you down, man.
Are tree swallow birds nocturnal birds?
No.
Birds that swallow other birds?
None. Its possible for bald eagles to swallow smaller birds. But it does not happen on occasion.
What birds begin with Swall?
Swallow
When do swallow birds migrates?
it depends
Do Swallow birds migrate?
yes!
Why does birds raise their head when they swallow water?
Because very few birds can swallow liquid - the have to let it trickle down their throats after they get it in their mouths.
What birds nest in cliffs?
cliff swallow
Do birds explode if they swallow gum?
no
