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This week’s new questions

Why do some flowers close up at night but others stay open? And is it more environmentally friendly to keep my 23-year-old petrol car, or to scrap it and buy a new electric car?

Abstract city street light explosion effect; Shutterstock ID 592442246; purchase_order: -; job: -; client: -; other: -

Is there a maximum possible acceleration?

2G4X8CE Female runner running with dogs in canicross style on hill

Does having four legs aid dogs with climbing?

Supernova explosion in the center of galaxy "Elements of this image furnished by NASA "; Shutterstock ID 1838493049; purchase_order: -; job: -; client: -; other: -

This week’s new questions

close up the fly on the window, on the glass, the concept of sanitation, dangerous insects, insect repellent, copy space; Shutterstock ID 1168097506; purchase_order: -; job: -; client: -; other: -

Why can a fly enter my home easily, but not escape as easily?

close up of young woman with closed eyes and glitter on face isolated on grey; Shutterstock ID 2207015511; purchase_order: -; job: -; client: -; other: -

Why do humans like sparkly things?

Close up of an augmented reality (AR) sand table, an advanced technology to create a learning tool for students.; Shutterstock ID 1857112591; purchase_order: -; job: -; client: -; other: -

This week’s new questions

HYMJ79 The famous prehistoric stone circle at Stonehenge on a bright spring day.

How did ancient Britons manage to mark the solstices with Stonehenge?

Mandatory Credit: Photo by R Dirscherl/imageBROKER/Shutterstock (14053960e) Snorkeler and Humpback Whales (Megaptera novaeangliae), Silverbanks, Dominican Republic Various 23aibebcaa

Could we use machine learning to converse with whales and dolphins?

Man opening door of retro refrigerator freezer.; Shutterstock ID 2275541755; purchase_order: -; job: -; client: -; other: -

This week’s new questions

Is it more efficient to leave the fridge briefly open when I am pouring milk for my tea or to close and reopen it, given that warm air is introduced whenever the door is opened? Michael Paine, Beacon Hill, Australia

How do crows develop such distinct and individual ‘voices’?

Why does our hair go white while eyebrows stay their original colour?

This week’s new questions

Why are so many spring flowers yellow?