The long-running series in which readers answer other readers’ questions on subjects ranging from trivial flights of fancy to profound scientific and philosophical concepts
Why are human eyes different colours? Gabrielle Kuper, aged 5, London
Post your answers (and new questions) below or send them to [email protected]. A selection will be published next Sunday.
More Stories
I became absorbed in strangers’ fertility journeys online
Virologist Wendy Barclay: ‘Wild avian viruses are mixing up their genetics all the time. It’s like viral sex on steroids’
Microsoft unveils chip it says could bring quantum computing within years