Podcast #128: We chat with Kent C Dodds about why he loves React and discuss what life was like in the dark days before Git. Listen now.

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If a signal of power $P$ is spread isotropically it will have power density $P_s = P/4\pi r^2$ at distance $r$. If there is a noise power density $P_n$ then the signal to noise ratio will be $$\text{SNR} = \frac{P_s}{P_n} = \frac{P}{4\pi r^2 P_n}.$$ Conversely, signals can be detected when the SNR>1, or $$r < \sqrt{\frac{P}{ 4\pi P_n}}.$$ Now we need to ...

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If an extraterrestrial civilization has a SETI project similar to our own, could they detect signals from Earth? In general, no. Most earthly transmissions are too weak to be found by equipment similar to ours at the distance of even the nearest star. But there are some important exceptions. High-powered radars and the Arecibo broadcast of 1974 (which ...

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Gadget-2 is publicly available. Google works well to find it. According to their website, it runs also on PCs. But don't get your hopes up, a single PC doesn't have enough computing power to simulate a whole universe. You'll need a bigger machine for that. They have installation instructions on the webpage (see "Users Guide" under "Documentation"). You ...

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