This week鈥檚 new questions
How far would you have to travel away from the sun for it to no longer be the brightest object you can see? And what advantage does mimicry give to birds?
Regulars
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How far would you have to travel away from the sun for it to no longer be the brightest object you can see? And what advantage does mimicry give to birds?
In the eye, what exactly leads to short- and long-sightedness? Does environment play a part, or genetics? The debate continues