Lifeboat Foundation

There’s a huge difference between sending humans to Mars and colonizing worlds outside our solar system.

In the adult brain, synapses are tightly enwrapped by lattices of the extracellular matrix that consist of extremely long-lived molecules. These lattices are deemed to stabilize synapses, restrict the reorganization of their transmission machinery, and prevent them from undergoing structural or morphological changes. At the same time, they are expected to retain some degree of flexibility to permit occasional events of synaptic plasticity. The recent understanding that structural changes to synapses are significantly more frequent than previously assumed (occurring even on a timescale of minutes) has called for a mechanism that allows continual and energy-efficient remodeling of the extracellular matrix (ECM) at synapses. Here, we review recent evidence for such a process based on the constitutive recycling of synaptic ECM molecules. We discuss the key characteristics of this mechanism, focusing on its roles in mediating synaptic transmission and plasticity, and speculate on additional potential functions in neuronal signaling.

An increasing number of studies are showing that synaptic function is strongly influenced by their local environment, including the molecules or cellular components in their vicinity. As a result, the classical synaptic framework (consisting of the pre-and postsynaptic compartments only) has gradually been extended to include the neighboring astrocytic processes (the “tripartite synapse”; Araque et al., 1999) and, ultimately, also the surrounding extracellular matrix (ECM; the “tetrapartite synapse”; Dityatev et al., 2006). Nowadays, the synaptic ECM is recognized to play an essential role in physiological synaptic transmission as well as in plasticity, and its dysregulation has been linked to synaptopathies in a wide variety of brain disorders (Bonneh-Barkay and Wiley, 2009; Pantazopoulos and Berretta, 2016; Ferrer-Ferrer and Dityatev, 2018).

Physicists at West Virginia University have overcome a long-standing limitation of the first law of thermodynamics.

Paul Cassak, a professor and associate director of the Center for KINETIC Plasma Physics at West Virginia University, and Hasan Barbhuiya, a graduate research assistant in the Department of Physics and Astronomy, are investigating the conversion of energy in superheated plasmas in space. Funded by the National Science Foundation, their findings, published in the Physical Review Letters journal, are set to revolutionize the understanding of how plasmas in space and labs are heated and could have far-reaching implications in physics and other sciences.

We often imagine that human consciousness is as simple as input and output of electrical signals within a network of processing units — therefore comparable to a computer. Reality, however, is much more complicated. For starters, we don’t actually know how much information the human brain can hold.

As part of belt-tightening at the company, Google told staff it would cut back on some of its lavish perks, including reducing café hours.

Woah, we’re halfway there. The company behind the hotly anticipated eVTOL Cavorite X5 announced it has completed construction of a 50-percent-scale prototype of its stylish flying vehicle concept.

Horizon Aircraft impressed us last year when it unveiled the Cavorite X5, with the Toronto-based company showing that the usually utilitarian world of eVTOLs could afford a little more attractive form with its function. The sleek, canard-style plane can takeoff, soar and land like a conventional aircraft, but the wings can open to reveal 16 ducted fans that provide the aircraft’s vertical lift. Once at altitude, the wing closes as it transitions to cruising. This technology would allow the aircraft to fly 98 percent of its voyage in a low-drag configuration, much like a traditional aircraft. When Horizon builds its full-scale version of the eVTOL, it will be powered by a hybrid electric system that can recharge a battery in-flight.

Explore the history of artificial intelligence, from Alan Turing’s Turing Test to the latest breakthroughs in machine learning and natural language processing.

An experiment that probed particles called gluons, which contain most of the mass of a proton, has revealed that a proton’s radius alters depending on whether you look at the particle’s charge or mass.

By Alex Wilkins

Lex Fridman Podcast full episode: https://www.youtube.com/watch?v=AaTRHFaaPG8
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GUEST BIO:
Eliezer Yudkowsky is a researcher, writer, and philosopher on the topic of superintelligent AI.

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