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Disappointed woman packing for a journey: she is standing in front of her suitcase overfilled with clothes, travel and vacations concept; Shutterstock ID 2314449417; purchase_order: -; job: -; client: -; other:

How do you get the most clothes into a suitcase? part 2

There’s a problem with advising the use of vacuum pumps, points out one reader

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

This week’s new questions

fluffy Persian kitten walking on the piano; Shutterstock ID 162425339; purchase_order: -; job: -; client: -; other:

What do animals hear when music is played to them?

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 wake up then need to pee? part 2

BG2B51 Back of man wearing a set of large false ears for a joke

What part do my ears play when I think of a tune? part 2

ENTETC Robin, (Erithacus rubecula), garden bird standing on top of a branch in winter, UK

This week’s new questions

BG2B51 Back of man wearing a set of large false ears for a joke

What part do my ears or auditory system play when I think of a tune?

MB9M93 Monster Truck Jumping Mid Air

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

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’s new questions

Is it possible for a planet to orbit a binary star system in a figure of eight? And what are the evolutionary and psychological bases of greed?

Do you wake up needing to pee, or need to pee because you’ve woken up?

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

Which animals can recognise individual people? Part 2

This week’s new questions