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“Now that Ukrainian airspace is in dispute and being contested and Ukrainian airspace runs right up alongside NATO airspace, we have conveyed to the Russians that we believe a conduit at the operational level is needed … so we can avoid miscalculation,” a senior Pentagon official told POLITICO. “And we have not received any response from them in terms of whether they agree, whether they are willing to set something up.”


As the U.S. and NATO rush weapons into Ukraine, DoD officials want more military channels to Putin’s top leaders. But Russia’s not picking up the phone.

Time crystals that persist indefinitely at room temperature could have applications in precision timekeeping.

We have all seen crystals, whether a simple grain of salt or sugar, or an elaborate and beautiful amethyst. These crystals are made of atoms or molecules repeating in a symmetrical three-dimensional pattern called a lattice, in which atoms occupy specific points in space. By forming a periodic lattice, carbon atoms in a diamond, for example, break the symmetry of the space they sit in. Physicists call this “breaking symmetry.”

Scientists have recently discovered that a similar effect can be witnessed in time. Symmetry breaking, as the name suggests, can arise only where some sort of symmetry exists. In the time domain, a cyclically changing force or energy source naturally produces a temporal pattern.

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I’m doing an abbreviated newsletter this week as I want to spend most of my energy amplifying the brave journalists on the ground reporting about this scary time. As so many have said — far more eloquently than me — the invasion of Ukraine is a story that impacts all of us, whether we’re on the ground there or not. And it’s hard to celebrate a funding round when scary times are the moment.

My brilliant colleagues put together a story on how the tech industry is responding to Russia’s invasion of Ukraine; I urge you to read it. While the situation is still ongoing, it’s clear that it’s already a tech story. And startups such as Grammarly, Ajax, People AI and Preply, backed by some of the world’s biggest VCs, are scrambling to support employees and operations amid the invasion.