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A close up of a common housefly on a green flower.

This week’s new questions

6 October 2021

Assuming free will exists, how complex does an organism have to be to exhibit it? And when bullets are fired up into the air, what speed do they return, and could they cause injuries?
Bird droppings on a car. (Photo by: Jeffrey Greenberg/Universal Images Group via Getty Images)

Why are bird droppings white, considering all they eat? (part 2)

6 October 2021

According to one reader, the whiteness of bird droppings might not be due to uric acid after all
Time concept. Men back in front of a clock.

How can we know that time exists?

6 October 2021

Time doesn’t really exist, say our readers, but we can still observe its action
Mature Woman Experiencing Hot Flush From Menopause Using Fan

Are there any evolutionary advantages of perimenopausal hot flushes?

6 October 2021

Hot flushes could just be a side effect of the perimenopausal changes in hormones, but could there be any benefits to them?

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