Black hole mergers modelled in 3D

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Simulations on a supercomputer have allowed Nasa scientists to understand finally the pattern of gravitational waves produced by merging black holes. The work should help the worldwide effort that is currently underway to make the first detection of these "ripples" in the fabric of space-time.

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On the importance of being pedantic (series: notes to myself)

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They say that to call someone pedantic is an insult. I'm not so sure. True, someone pedantic is obsessed with minor details, small errors, or tiny imperfections. And a pedantic is also someone who cares too much about all such things not to let you know about them, advising or correcting, disagreeing or disapproving. And yes, if you are a pedant, you are more than just occasionally pedantic. This can happen to anybody, the excessive emphasis on some narrow or boring detail being a tendency we all share when it comes to matters about which we care very much. But if you are a pedant, being pedantic is your daily stance, your intrinsic nature, your way of living. You are always, consistently, reliably, systematically pedantic, from the moment you wake up, about the exact place where the slippers should be next to your bed, all the way to the moment you go to sleep, and the exact place where the phone should be placed to recharge. If you are a true pedant, no detail is too trivial, no
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[22 April update: at the Digital Ethics Lab (OII, University of Oxford) we have elaborated a list of 16 questions to check whether an app is ethically justifiable, the full article, open access, is available here ] There is a lot of talk about apps to deal with the pandemic . Some of the best solutions use the Bluetooth connection of mobile phones to determine the contact between people and therefore the probability of contagion. In theory, it may seem simple. In practice, there are several ethical problems, not only legal and  technical ones . To understand them, it is useful to distinguish between the validation and the verification of a system.  The validation of a system answers the question: "are we building the right system?". The answer is no if the app is illegal,  for example, the use of an app in the EU must comply with the GDPR; mind that this is necessary but not sufficient to make the app also ethically acceptable, see below; is unnecessary, f
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There are some famous parables in the New Testament in which people travel, arrive, go away, or come back (for example, Matthew 25:1-13 on the ten virgins; Luke 15:11-32 on the prodigal son). But I have one in mind that has puzzled me for a long time: Matthew 25:14-15 (on the talents), about the man, probably representing God, who is “going on a journey” (ἀποδημῶν) and “comes back after a long time” (πολὺν χρόνον).  The word ἀποδημῶν means “about to go on a journey”, and it is the same word used in another parable, when God goes away, again (Matthew 21:33-46). In both cases, he leaves the house for reasons that are not provided. Why does he have to go? Can he not stay? It seems that more pressing business calls him elsewhere. Something or someone is more important than us, who live in the house. An emergency? Or perhaps just a test? Maybe he just wants to see what the mice do when the cat is away. Whatever the motives, there is a journey, a time before and after his presence, and then
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I grew up with two conceptions of immortality in my mind. It took me a while to realise that they shaped my behaviours and my choices. My identity. Neither turned out to be credible. But both were useful, for they taught me a lesson. As a Catholic, I was brought up believing in a dream. I was immortal. Not backward, for I was born. But forward, because I would not die. Actually, this is not the dream, for it may be the worst of all nightmares. It is the second part that turned it into the best deal ever. I was taught, since I can remember, that if I behaved decently and repented about the rest, I was going to live a life of heavenly bliss forever, and ultimately resurrect, just the way I was (or even better), and join all the people I had ever loved and indeed billions more.  As a kid, I worried, not deeply yet frequently, about eternal damnation, the nasty side of being immortal. Speak of side effects! Better be annihilated, I calculated, than suffer horribly forever. And sometimes I
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