Dr Helen Liang is proud of her 100% recycled petri dish, the first ever made in the UK Scientists have opened the UK's first facility that can recycle plastic waste from research labs. Every year ...

In it, an apparently normal-looking petri dish is treated so as to reveal a message when wetted with water vapor. The contrast between hydrophobic and hydrophilic surfaces, which is not visible to ...

Petri dish A glass or plastic circular dish. Used in combination with agar to grow cells. Quadrat A square grid, often 1m squared. Used to sample plants or slow moving animals e.g. snails.