These flower-like zinc oxide particles are three micrometres in size (colourised electron microscope image). (Image: Dong Wook Kim / Max Planck Institute for ... They are made of extremely thin petals ...

Not only are these particles effective; they appear visually striking under a microscope too, resembling tiny paper flowers or desert roses. They are made of extremely thin petals that arrange ...

These flower-like zinc oxide particles are three micrometres in size (colourised electron microscope image). Dong Wook Kim ... comprising extremely thin petals arranged in a floral pattern.

Although it is solitary now, it was released into the air along with thousands of other pollen grains. This is a microscopic image of a single grain of pollen (1) sitting on the petal of a thale-cress ...

For this contest please enter your colour photos of flowers that bloom in the autumn. These could be still flowering in the garden or captured as an indoor still life, but please only enter real ...