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Kid with jet pack pretend to be superhero. Child playing in summer. Kid having fun outdoors. Child pilot against summer sky background. Success, leader and winner concept. Imagination, freedom concept; Shutterstock ID 450428614; purchase_order: -; job: -; client: -; other: -

Could any photons that were around me in my childhood still exist?

Our readers delve into the mind-bending origin and fate of photons, including the ones that enter your eye

AR4J5D Drop of blood suspended on one finger after prick for diabetic test

Why are many people squeamish about the sight of blood? (part 2)

Milk coffee is a combination of equal parts espresso, steamed milk and milk froth.

Does a latte cool faster than a cappuccino? (part 2)

Scones

This week’s new questions

CX3N1D three 3 old men friends talking arguing discuss

How much of my body from 40 years ago remains part of me today?

B70G62 Suriname, Brownsweg, Brownsberg National Park. Woman looking at Tarantula , Avicularia Metallica.

Do spiders survive if thrown from a height out of a window?

Trip to the moon (lunar) concept - Long exposure night time rocket launch with solar eclipse "Elements of this image furnished by NASA" ; Shutterstock ID 1937796442; purchase_order: -; job: -; client: -; other: -

What happens if I shine a torch, moving at the speed of light? Part 2

Sore Tooth Decay. Dental Care And Pain; Shutterstock ID 1895847487; purchase_order: -; job: -; client: -; other: -

This week’s new questions

T4AEYJ Stellar explosion shining in deep space, cosmic star blast in Universe. High resolution galaxy background.

In which direction in the sky did the big bang take place?

Humans have “good bacteria”, but what about “good viruses”?

Our body is indeed teaming with helpful viruses, but we are still working out what makes them “good” and “bad”

What’s the best angle for a hosepipe to spray water furthest? (Part 2)

This week’s new questions

Does a latte cool faster than a cappuccino?

Why do loose screws only get looser and not the other way round?