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Bullet shells on the ground as members of the FBI practice their investigation techniques

Chemistry

Missing bullets can be identified by ricochet residue at crime scenes

Investigating gun crime is challenging if bullets have been removed from the scene – a tool that can identify bullets from the shavings they leave as they ricochet off surfaces could help

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A molecular structure

Chemistry

The tightest knot ever made is a tied-up chain 54 atoms long

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Health

Stretchy electrodes shrink when wet to fit snugly around organs

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Spiral strand of DNA

Chemistry

DNA repair has been captured in a step-by-step molecular movie

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Robotic chemist discovers how to make oxygen from Martian minerals

Space

Robotic chemist discovers how to make oxygen from Martian minerals

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fabrics after spraying

Chemistry

Spray-on sensors can turn any clothing into motion-sensing technology

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Cannabis leaf

Life

The cannabis of the future might not come from plants

Features

salt crystals dissolving in beaker with water

Chemistry

Atom-by-atom recordings track what happens after substances dissolve

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Attempts to recreate red matter

Physics

Superconductor hopes dashed after journal retracts ‘red matter’ study

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A whiff of weed

Chemistry

Why cannabis smells like skunk – and how that could soon change

Researchers recently identified the chemical source of marijuana's distinctive scent. The finding could help lead to less pungent pot or strains with new flavours

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Technology

Tiny generator uses the motion of molecules to produce electricity

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Comment

Lessons in Chemistry review: TV show delivers – just stay with it

Culture

Chemistry

Nobel prize for chemistry goes to trio behind quantum dots work

News

Chemistry

Superglue alternative made from soya is strong but biodegradable

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