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Why are birds mostly monogamous, but not mammals?

Birds are mostly monogamous because it is the only way that males can be sure of having any surviving offspring.

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This week鈥檚 new questions

Tom Gauld: Maths puzzles for conspiracy theorists

Twisteddoodles on two distinct categories of video observations

Mongolia - Uvurkhangai province - Portrait of Ganbaatar Davaasuren (?Bukhuu? ) riding one of his horses.

Humans

Stunning photos show nomadic life of Mongolian goat herders

GLASTONBURY, ENGLAND - JUNE 20: A full moon rises behind Glastonbury Tor as people gather to celebrate the summer solstice on June 20, 2016 in Somerset, England. Tonight's strawberry moon, a name given to the full moon in June by Native Americans because it marks the beginning of strawberry picking season, last occurred on the solstice on June 22, 1967 and it will not happen again on the summer solstice for another 46 years until June 21, 2062. (Photo by Matt Cardy/Getty Images)

Space

How to identify moon craters and mountains on the lunar surface

A man holds his lurcher dog as the canine excitedly licks and nuzzles with a woman who smiles and strokes the pet.

Is sweat from exercise different from that due to anxiety or illness?

2J7J6G8 Berlin, Germany, May 09, 2022, German Chancellor Olaf Scholz and French President Emmanuel Macron attend a joint press conference at the chancellery in Berlin, Germany, May 09, 2022. This is Macrons first official visit after his re-election. The two leaders will discuss bilateral matters and Russia's ongoing war in Ukraine.(Photo by Omer Messinger)

Why do speakers at public events wave their hands around so much?

EX0YM9 Stirring tomato sauce and black pepper in a glass bowl with spoon

This week鈥檚 new questions

Do you know where your carrots come from? Science can help if not

Feedback is our weekly column of bizarre stories, implausible advertising claims, confusing instructions and more

Tom Gauld on the learning potential of artificial intelligence

Twisteddoodles on why grapefruit interferes with medications

Humans

How to use science (and a dash of acid) to improve your scrambled eggs

God’s illustrious second career as an aeronautics expert