An experiment 180 years ago first demonstrated a connection between light and electromagnetism – but the link is deeper than we thought

I start with an item found below the leg of one's pants
Change one letter, and I may tell of romance
Again change one letter, and I may be just a glance
Again change one letter, and security do I enhance
Again change one letter, and I am random chance

What are we?


Check Braingle.com for the answer.

Rather than being a recent cultural development, kissing may have been practised by other early humans like Neanderthals and our ape ancestors

Rather than being a recent cultural development, kissing may have been practised by other early humans like Neanderthals and our ape ancestors

A comprehensive UN report has found that cities and towns are home to 81 per cent of the world’s population, much more than previously thought

A comprehensive UN report has found that cities and towns are home to 81 per cent of the world’s population, much more than previously thought

Ancient rock art was meant to be heard as well as seen and now acoustic archaeologists are bringing the sounds of prehistoric rituals to life

Ancient rock art was meant to be heard as well as seen and now acoustic archaeologists are bringing the sounds of prehistoric rituals to life

AlphaEvolve, an AI system created by Google DeepMind, is helping mathematicians do research at a scale that was previously impossible - even if it does occasionally "cheat" to find a solution

AlphaEvolve, an AI system created by Google DeepMind, is helping mathematicians do research at a scale that was previously impossible - even if it does occasionally "cheat" to find a solution

Facing its worst drought in decades, Iran is attempting to stimulate rain by spreading seeding agents in clouds, but the technique is likely to have modest benefits at best

Facing its worst drought in decades, Iran is attempting to stimulate rain by spreading seeding agents in clouds, but the technique is likely to have modest benefits at best

A major settlement in Central Asia called Semiyarka dating back to 1600 BC had houses, a big central building and even an industrial zone for producing copper and bronze

A major settlement in Central Asia called Semiyarka dating back to 1600 BC had houses, a big central building and even an industrial zone for producing copper and bronze

A 12,000-year-old clay sculpture found in Israel depicts a goose on the back of a woman, and archaeologists suggest it may be a depiction of an animistic mythological scene

A 12,000-year-old clay sculpture found in Israel depicts a goose on the back of a woman, and archaeologists suggest it may be a depiction of an animistic mythological scene

Neanderthals were thought to have structures inside their noses that helped them deal with the cold, but analysis of an exceptionally preserved specimen contradicts that

Neanderthals were thought to have structures inside their noses that helped them deal with the cold, but analysis of an exceptionally preserved specimen contradicts that

Some ants kill the queens of another species and take over their colonies, but we now know at least one species gets workers to do the dirty work for them through a kind of chemical subterfuge

Some ants kill the queens of another species and take over their colonies, but we now know at least one species gets workers to do the dirty work for them through a kind of chemical subterfuge