Francesca, David, Sondra discussed on The Naked Scientists


Let's go back to the questions now Francesca. We have got a question here from four music, David who wrote if light cannot escape from a black hole could one speculate that the gravitational pull from a black hole is faster than the speed of light. In other words, what's the speed of gravity? If indeed it does speed so gravity traveled at the speed of light as far as we know when we say light can't escape for black hole. Absolutely true. And that should be with the way that a black hole. Warps the space in which the light is traveling. So whatever happens to it. It ended up going closer to the black hole since the observation of gravitational waves. We know very precisely that gravity travels. Very very close to the speed of light. We observed an event in which two neutron stars merged and we saw both gravity waves and light emitted from that event and based on the. Arrival times of the gravity waves in the light. We know that they travel very very similar speeds much Fran. Now, an allure Sondra wants to know how does your childhood affect your mental health risk later, if it'll so we know that your challenge is actually really important for mental health risk one important clue is that mental health risk often emerges still in childhood. And we know that a negative experiences in early life are really really important for making you more vulnerable to developmental illness later on in life. The idea is that if you have lots and lots of stress when your brain is developing when you're functioning is developing still, it will impact or so the stress will shape, your development, and an example of this is for instance, that your brain is really able to quickly detect threatening things stimuli in the environment. Which is from an evolutionary point of view is really important. Because when you're walking around in the woods seeing a bear will help you to respond to that quickly. Right. But when the bears in your home environment day in day out this chronic level of stress might lead to your brain to be developed slightly differently making you hyper vigilant to threatening experiences in the real world. So if someone has had a very traumatic upbringing or a bad series of life events when the little what should they do to make sure that they do reinforce the positives and don't slip into this vicious cycle of developing the risk factors that would.

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