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Figure 1: Sample video, questions, and answers from our CoLlision Events for Video Representation and Reasoning (CLEVRER) dataset.

A Hybrid AI Model Lets It Reason about the World’s Physics Like a Child

March 6, 2020

A new data set reveals just how bad AI is at reasoning—and suggests that a new hybrid approach might be the best way forward.

Questions, questions: Known as CLEVRER, the data set consists of 20,000 short synthetic video clips and more than 300,000 question and answer pairings that reason about the events in the videos. Each video shows a simple world of toy objects that collide with one another following simulated physics. In one, a red rubber ball hits a blue rubber cylinder...

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Book cover for "The Second Kind of Impossible"

Harvard Science Book Talk: Paul Steinhardt, "The Second Kind of Impossible"

March 5, 2020

THE SECOND KIND OF IMPOSSIBLE tells one of the strangest scientific stories that you will ever hear – a thirty-five year quest for new forms of matter, known as quasicrystals, that violate scientific principles that had been established for centuries. The talk will describe the scientific odyssey that unfolds over the ensuing decades, first to prove the validity of the idea, and then to pursue Steinhardt's wildest conjecture: that nature made quasicrystals long before humans discovered them. Along the way, his team encounters clandestine collectors, corrupt scientists, secret...

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Schematic drawing of the resistivity of magic-angle graphene

Experiments on magic-angle graphene reveal a “strange metal” phase and transport behavior consistent with so-called Planckian dissipation

February 20, 2020

Magic-angle graphene captured the attention of condensed-matter physicists in 2018 when it was discovered that this material—made of two sheets of graphene with slightly misaligned lattice orientations—is a superconductor. Moreover, observations showed that the phase diagram of magic-angle graphene is similar to that of copper oxide high-temperature superconductors, with an insulating region next to a dome-shaped superconducting region. Now, Pablo Jarillo-Herrero from the Massachusetts Institute of Technology, Cambridge, and his colleagues report that magic-angle graphene...

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