How trees 'talk' to each other - The Naked Scientists
网页2024年6月18日 · Crowther Lab, ETH Zurich. Play Download. Trees have been around for hundreds of millions of years and cover about 30% of the Earth’s surface. That level of ubiquity and proximity implies that trees can, to an extent, communicate with one another. To do this, trees have formed a symbiotic relationship with another group of …
Is ink poisonous? | Questions | Naked Scientists
网页2010年10月3日 · Answer. Chris - Ancient inks were made from crown galls. On oak trees, you'll find "oak apples" - these are galls which are on the wood of the oak tree. They look like little spheres and are made by a parasitic insect or an infection that puts some chemicals into the side of the oak tree. They end up being very rich in tannin so people would ...
Updating Evolution Evidence - The Peppered Moth | Interviews
网页2008年6月29日 · There was an original observation made in 1848 in Manchester in which there was a dark form of the so-called Peppered Moth recorded. The Peppered Moth, its normal form is light in colour with a black speckling which gives it its name. In 1848 the first black or melanic form of this moth was recorded. Towards the end of …
The hunt for dark energy | Interviews - The Naked Scientists
网页2024年6月4日 · Will - It seems extraordinary. And the part that really bakes my brain is the nature of dark energy suddenly accelerating the universe, about 5, 4 billion years ago. And as you're saying, it might be able to evolve further in the future. It almost sounds like something that has its own mind to make up.
Does urinating on plants help or hurt them? | Science Questions
网页2007年9月2日 · Answer. Urine will contain lots of things that plants like such as water and nitrates, which can act like fertilizers. But if you wee in the same place too much, you will build up a concentration of salts in the soil, and this can affect osmosis of water into the plant's roots. Salts also accumulate in the plant's leaves, potentially causing ...
Dark matter and dark energy: mapping the dark universe
网页2024年6月4日 · Francesca - The first hints at dark matter were really discovered by Zwicky in the 1930s, and he was looking at galaxy clusters. So these are massive structures. And at that time when Zwicky was working, most physicists assumed that the matter we can actually detect directly with our telescopes was all that was.
Do plants eat dirt? | Podcasts | Naked Scientists
网页2019年1月21日 · The proof that plants do not eat soil is attributed to a 17th century scientist called Jean Baptiste van Helmont. Van Helmont weighed a willow before planting it in a known weight of dried soil, five years later he re-weighed the tree, dried the soil and re-weighed that too. The willow had increased in mass, but the soil had not decreased.
Can trees grow in concrete? | Science Questions - The Naked …
网页2018年6月12日 · Eleanor - That is a really good question. Trees, and plants in general, can be amazing in adapting how they grow to the different environments in which they are. So you can think about something like a willow tree, and if you plant it by a river it might not put down very strong roots because the water’s right there.
How much green skin would we need to photosynthesise?
网页2017年8月22日 · Georgia - This means that plants can only perform the already inefficient photosynthesis on 5% of the light they’re exposed to. Christopher - We’ll assume that our new skin cells would act about the same. Also, on average, each human has about 1.7 sq metres of skin and only maybe half of it would be exposed to the Sun say if you’re laying ...
Q&A: Defining AI, Dark Energy & Dr NO - Naked Scientists
网页2022年2月24日 · Whereas dark matter and dark energy appeared to be polar opposites; they're doing very different things. Dark matter is like a glue that helps stick things in the universe together, like a galaxy, for example. Whereas dark energy seems to be something that's doing the opposite. Not binding things together, but pushing things apart.