27 July 2022
Feedback raises an eyebrow at the cap which reads brainwaves to help China detect pornography, while also investigating secret cannabis facilities in Australia - and grave-robbing badgers
27 July 2022
Homemade science "experiments" are full of spectacle, but often miss the joy of true discovery. Alom Shaha offers a simple solution with his twist on the classic bubble volcano
27 July 2022
If you wrote a word on a ball of string, then unravelled it, how challenging would it be to decipher the word? Howard Owens, Exeter, Devon, UK
27 July 2022
Children tend to run rather than walk due to prehistoric habits suggests one reader, but it could also be to do with their strength and balance
27 July 2022
Compasses will continue to work a long way from Earth’s surface - but it’s at the poles that you’ve got to worry
27 July 2022
New Scientist readers share their tried and tested methods for stopping hiccups
27 July 2022
Can you solve this week’s arithmetical puzzle, Hydra? Plus the answer to puzzle #177
