杏吧原创

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: -

As average sea levels rise, will map heights need to be recalculated?

Height above mean sea level is only one way of calculating height, say our readers, and in any event, the effects of any change wouldn鈥檛 be visible on a paper map given the scales

cute two cats on a balcony railing; Shutterstock ID 1662554986; purchase_order: -; job: -; client: -; other: -

Are humans the only animal to experience vertigo?

2BE3Y6H Bedding and sheets are freshly laundered and are hanging out to dry on a washing line in residential back garden.

Why does a duvet bag up all the other items in the washing machine?

Builder or carpenter working on the roof - silhouette with strong back light; Shutterstock ID 84416038; purchase_order: -; job: -; client: -; other: -

This week鈥檚 new questions

explosion of atomic bomb on background of sky; Shutterstock ID 51881707; purchase_order: -; job: -; client: -; other: -

Is there a minimum size for an atomic bomb?

Theres nothing like a rejuvenating shower. Cropped shot of a handsome young man having a refreshing shower at home.; Shutterstock ID 2142806437; purchase_order: -; job: -; client: -; other: -

When I step into a hot shower, why do I get a shiver down my back?

Golden lion tamarin; Shutterstock ID 121264012; purchase_order: -; job: -; client: -; other: -

Why aren鈥檛 humans covered in hair like other primates are? Part 3

Astronaut ascends a lunar hill against a backdrop of brilliant cosmic clouds and starry sky. 3d render; Shutterstock ID 2441449595; purchase_order: -; job: -; client: -; other: -

This week鈥檚 new questions

2G8TR2M Young woman sitting and holding a blue mug of tea outdoor

Will my tea cool more quickly if my hands are cupped around the mug?

Close up of woman's eye

Why do victims of violent attacks sometimes take no immediate action?

Responses such as fight, flight or freeze are part of the first, 鈥渁larm鈥� stage of the stress response, says one reader, and one way to prepare yourself for such eventualities is through martial arts

This week鈥檚 new questions

Is it greener to keep my petrol car or scrap it for an electric one?

Why is it harder to remove a shirt crease with an iron than put it in?

What is the best way to minimise crumbs when slicing bread? Part 2