Particles of light cannot be divided into smaller particles, but if you try to snip off the end of one, instead of shortening it multiplies

Twin Trouble

Ryan and Craig were identical twins born in Seattle in 1961. Ryan was born before Craig, but according to their birth certificates, Craig was older than Ryan. How come?


Check Braingle.com for the answer.

According to a mathematical model of how people weigh up different outcomes, the optimal strategy is to be ambitious, but not overly so

According to a mathematical model of how people weigh up different outcomes, the optimal strategy is to be ambitious, but not overly so

Quantum Backrooms is a horror game in which the player explores eerie rooms. The twist is that the rooms have been generated by a quantum computer

Quantum Backrooms is a horror game in which the player explores eerie rooms. The twist is that the rooms have been generated by a quantum computer

We're increasingly prioritising our own needs over those of the wider community, which may be causing us to love our partners less intensely

We're increasingly prioritising our own needs over those of the wider community, which may be causing us to love our partners less intensely

Bacteria created using mirror images of natural biomolecules would pose a grave threat to life on Earth, some researchers warn, but a new study suggests they would struggle to survive in the wild

Bacteria created using mirror images of natural biomolecules would pose a grave threat to life on Earth, some researchers warn, but a new study suggests they would struggle to survive in the wild

A cancer-killing virus has stopped pancreatic tumours from growing and spreading in three people in an initial safety trial, raising hopes that it may help to beat the deadly condition

A cancer-killing virus has stopped pancreatic tumours from growing and spreading in three people in an initial safety trial, raising hopes that it may help to beat the deadly condition

Even if you’ve never bought any cryptocurrency, like columnist Karmela Padavic-Callaghan, your money may be affected by bitcoin’s fate – which is uncertain, as quantum computing advances are threatening to make the encryption protecting it useless

Even if you’ve never bought any cryptocurrency, like columnist Karmela Padavic-Callaghan, your money may be affected by bitcoin’s fate – which is uncertain, as quantum computing advances are threatening to make the encryption protecting it useless

Dive into the opening of The Selfish Gene's first chapter 'Why are people?', the New Scientist Book Club’s read for June to mark 50 years since the popular science classic was first published

Dive into the opening of The Selfish Gene's first chapter 'Why are people?', the New Scientist Book Club’s read for June to mark 50 years since the popular science classic was first published

Until recently, the Pamir mountains in central Asia have bucked the global melting trend, but in 2025, the region’s glaciers experienced a massive loss of ice due to extreme heat

Until recently, the Pamir mountains in central Asia have bucked the global melting trend, but in 2025, the region’s glaciers experienced a massive loss of ice due to extreme heat

Name Them

What do these groups of words have in common?

1. Man true, hairy
2. Son nick, yard rich
3. Son will, row wood
4. Grant, us list you
5. More fill, lard mill
6. Ding hard, wren war


Check Braingle.com for the answer.

After an AI from OpenAI found a trick to solve an 80-year-old conjecture from Paul Erdős, mathematicians have borrowed the same technique to solve another important problem