Public lectures given at the Institute for Advanced Study. Suppose that G is a connected, quasisplit, orthogonal or symplectic group over a field F of characteristic 0. We shall describe a classification of the irreducible representations of G(F) if F is local, and the automorphic representations of G in the discrete spectrum if F is global. The classification is by harmonic analysis and endoscopic transfer, which ultimately ties the representations of G to those of general linear groups.
Polar Wander. + Author Affiliations Abstract We present new paleomagnetic data from three Middle Neoproterozoic carbonate units of East Svalbard, Norway. The paleomagnetic record is gleaned from 50 to 650 m of continuous, platformal carbonate sediment, is reproduced at three locations distributed over >100 km on a single craton, and scores a 5–6 (out of 7) on the Van der Voo (1990) reliability scale. Two >50° shifts in paleomagnetic direction are coincident with equally abrupt shifts in δ13C and transient changes in relative sea level.
We explore four possible explanations for these coincidental changes: rapid plate tectonic rotation during depositional hiatus, magnetic excursions, nongeocentric axial-dipole fields, and true polar wander.
Technology. 3D Map of the Brain. We knew anatomy could be gorgeous, but this is beyond anything else we’ve ever seen, and it’s guaranteed to be something you haven’t seen, being the first 3D image of a brain’s connections.
Van Wedeen, a Harvard radiology professor, is awestruck: “We’ve never really seen the brain – it’s been hiding in plain sight.” Conventional scanning has offered us a crude glimpse, but scientists such as Wedeen aim to produce the first ever three-dimensional map of all its neurons. They call this circuit diagram the “connectome”, and it could help us better understand everything from imagination and language to the miswirings that cause mental illness.
But with 100 billion neurons hooked together by more connections than there are stars in the MilkyWay, the brain is a challenge that represents petabyte-level data. Photographed above is the 3D image of an owl-monkey’s brain. Link [via] Cool Science Experiment. Cool Science Experiment. Retired Site The Wired Science site has been retired from pbs.org and is no longer available.
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In our virtual lab, use the "cascade" process to achieve dramatically lower temperatures. States of Matter Adjust temperature and pressure, and watch as gases become liquids, liquids harden into solids, and more. A Matter of Degrees Create your own temperature scale, then see how it compares to those of Fahrenheit and Celsius. Anatomy of a Refrigerator You likely have one, but do you know how it works? The Ice Trade In this game, dispatch 10 ships loaded with natural ice to Florida, Brazil, or India.