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MB9M93 Monster Truck Jumping Mid Air

What are the pros and cons of using carbon dioxide in tyres?

From convenience to the environmental impact, air is still preferable to carbon dioxide in tyres, say our readers

Leopard gecko lizards on the rock, cute lizards that are easy to care for, eublepharis macularius, animal closeup; Shutterstock ID 2551815383; purchase_order: -; job: -; client: -; other: -

Which animals can recognise individual people? Part 3

3BHN5M7 A woman holds a sign that reads Greed is not a virtue during a protest across the street from Florida Congresswoman Maria Elvira Salazar's Office.

This week鈥檚 new questions

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Where did I put it? Loss of vital crypto key voids election

Twisteddoodles on an unexpected Martian discovery

Tom Gauld on the travails of an earthworm

Around two hundred of people ran in Santa Claus costumes during the Santa Run event organized by the foundation 'Rotary Santa Run' in the Dutch city of Breda. The event raised at least 8.000EUR for two local charities. On December 18th, 0222. (Photo by Romy Arroyo Fernandez/NurPhoto via Getty Images)

91色情片

The quick and easy ways to stay fit this holiday season

Neon Welcome signboard retro style, Toilet sign with boy, girl figure. Glowing inscription on dark red brick background. Suitable for night outdoor banner, advertisement, shop, night club. 3D render.; Shutterstock ID 2265283835; purchase_order: -; job: -; client: -; other:

Do you wake up needing to pee, or need to pee because you鈥檝e woken up?

Child's Spinning Top Toy; Shutterstock ID 365058569; purchase_order: -; job: -; client: -; other:

What would happen if a spinning disc neared the speed of light? Part 2

Leopard gecko lizards on the rock, cute lizards that are easy to care for, eublepharis macularius, animal closeup; Shutterstock ID 2551815383; purchase_order: -; job: -; client: -; other: -

Which animals can recognise individual people? Part 2

Our readers鈥� experiences with a gecko and crows show how some animals can tell people apart

This week鈥檚 new questions

The science of swimming trunks 鈥� including tightness analysis

Life

‘Horrific and beautiful’ whale rescue image wins photography prize

Tom Gauld on plans for an exciting new technology