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Last Word

KMXN2B Beautiful fun happy smiling African American couple wearing white shirts laying in grass, faces of woman and man next to eachother in opposite

Grinning is a sign of aggression in animals, so why do humans smile?

One reader introduces us to his grinning Dalmation dog to shed further light on how smiling evolved

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Dangerous Zika Infected Mosquito Skin Bite. Leishmaniasis, Encephalitis, Yellow Fever, Dengue, Malaria Disease, Mayaro or Zika Virus Infectious Culex Mosquito Parasite Insect Macro.

This week’s new questions

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Mature Woman Experiencing Hot Flush From Menopause Using Fan

Are there any evolutionary advantages of perimenopausal hot flushes?

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Time concept. Men back in front of a clock.

How can we know that time exists?

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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)

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

This week’s new questions

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2D4B1M5 Sporty young woman tying the shoelaces before run or jog.Concept of sport and healthy lifestyle.

What is the best way to tie shoelaces?

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Does the expansion of the universe apply to atoms and objects like me?

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The impossibly low rainbow: The mystery continues

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We found this object a couple of weeks ago in the surf on Kilvickeon Beach on the south end of the Isle of Mull in Scotland. It was originally dark and got lighter as it dried out. It has a bit of an odd smell! Both sides which look very different. Taken a few days apart, tic-tac box for scale!

This week’s new questions

Can you help identify a strange blob found on a Scottish beach? And why hasn’t domestication caused cats to evolve as much as other domesticated animals?

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Does talking or singing to plants help them to grow better?

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Could humans evolve into two different species in the future?

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This week’s new questions

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Why do dogs enjoy rolling in smelly fox or bird faeces?

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