3. Photosynthesis probably uses quantum effects.
Photosynthesis turns sunlight into energy for plants. We don’t quite know how it works, but it seems to involve quantum effects including entanglement, which inextricably links particles no matter where they actually are.
8. You can thank the wavelength of blue light for perfect blue skies too.
During the day, sunlight passes through less atmosphere as it comes from directly overhead. Blue light is still scattered but not scattered away completely, so the sky looks blue.
9. Hayfever is caused by three different types of pollen.
Tree pollen, grass pollen, and weed pollen can all trigger the sneezing and itchy eyes that seem to go hand in hand with summer for many people. Tree pollen is mostly released in spring, but grass and weed pollen start in spring and go through summer. And spending more time outside in summer means its harder to avoid pollen.
11. Getting sunburn can damage the DNA in your skin cells.
And damage to DNA can kill the skin cells – this is one of the reasons your skin peels after getting badly sunburnt. The body can repair DNA after its damaged, but it can’t always be fixed. The mutated DNA is what can lead to skin cancer.