19 July 2023
How do dogs recognise another animal is also a dog when there is such vast array of canine shapes and sizes? And why can’t we conjure up smell and touch in our heads, but we can “listen” to music when nothing is coming through our ears?
19 July 2023
Only every 100 billion years, says one reader - longer than the lifetime of the current stable solar system
19 July 2023
Cats hate getting wet but dogs don’t, say our readers - who also hint that cats may have evolved to a superior level to their canine companions
19 July 2023
This is a question of how we define “Earth”, say our readers, but we also need to consider when light from the young sun could have pierced Earth’s atmosphere
12 July 2023
Can all animals get drunk? And why was there no runaway greenhouse effect 201 million years ago, when Earth was a hothouse?
12 July 2023
Our readers point out that history shows it is best to stick to one measure of time to avoid confusion – but add that it may not be humans who get to decide how time is calculated on Mars
12 July 2023
Such machines already exist, in a sense, say our readers - but an immortal being might also be using effects science has yet to understand
5 July 2023
Why are the largest modern land animals so much smaller than the largest land dinosaurs, and why does runny honey stop dripping when there’s still plenty left on the spoon?
5 July 2023
One reader controversially suggests installing two dishwashers, thus reducing the need for cupboard space
5 July 2023
Humans evolved to remember sounds, not letters, so this isn’t surprising, say our readers – but we can easily remember words for which we have conceived an incorrect pronunciation
