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2K18TC6 London, UK. 16th Sep, 2022. Shaikha Al Mazrou, Red Stack, 2022, Lawrie Shabibi - Frieze Sculpture, one of the largest outdoor exhibitions in London, including work by international artists in Regent's Park. Credit: Guy Bell/Alamy Live News

Why do we use pillows? part 3

Our readers highlight how there are many different types of pillow, and you may not even need one at all

This week鈥檚 new questions

3CHF9KF Towels drying on stone wall

Is it more efficient to dry towels hung up portrait or landscape?

cinematic flight through dark deep space asteroid field with stars; Shutterstock ID 2687214359; purchase_order: -; job: -; client: -; other:

If Earth exploded, how many rocks would have signs of life?

(Original Caption) 7/5/1946-The roller coaster is a rough ride, but do they love it! This unposed photo was taken by the intrepid photographer from a front seat, as the car made a stomach-dropping descent. A companion clutched the camera while he clicked the shutter. ACME ROTO SERVICE FOR IMMEDIATE RELEASE BPA 2 #124

Why do we scream in fear? part 3

Gold jewelry with space for writing; Shutterstock ID 735656746; purchase_order: -; job: -; client: -; other:

Why do jewellery chains become so tightly knotted together? part 2

2B5DJY0 Row of homemade jars of jam for sale on the market counter.

This week鈥檚 new questions

In the Medical Laboratory, Anonymous Female Patient Lying on a CT or MRI Scan Bed Undergoes Scanning Procedure with Red Lasers. Advanced Healthcare Facility with High-Tech Equipment; Shutterstock ID 2587414477; purchase_order: -; job: -; client: -; other:

Why are MRI machines so noisy and what stops us making them quieter?

Will the ocean ever be too salty for life to thrive? Part 2

Planet in water - Moon. Science fiction art. Solar system. Elements of this image furnished by NASA; Shutterstock ID 579784837; purchase_order: -; job: -; client: -; other:

If all Earth鈥檚 water were put in a ball, how large would it be? Part 2

One reader highlights an important detail other respondents may have missed

This week鈥檚 new questions

Do birds actually sleep more in winter?

Is the concentration of salt in the oceans gradually increasing?

Why do we use pillows? part 2