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Foreign military students from the U.S. Navy’s Patrol Craft Officer course conduct a field training exercise at the Stennis Space Center in Mississippi in 2009. Department of Defense

US-educated foreign soldiers learn ‘democratic values,’ study shows – though America also trains future dictators

The US Armed Forces run 14 programs in over 150 countries, providing education and training for roughly 70,000 foreign military personnel each year. What, if anything, are they learning?
Exposure notification systems alert people when they’ve been exposed to the coronavirus but don’t record the information. AleksandarGeorgiev/E+ via Getty Images

How Apple and Google let your phone warn you if you’ve been exposed to the coronavirus while protecting your privacy

Bluetooth wireless communication makes it possible to track when people have been exposed to people infected with the coronavirus. The right cryptography scheme keeps alerts about exposures private.
The success of Brazil’s vaccine program will have a ripple effect on countries to which it exports commodities such as steel. Michael Dantas/AFP via Getty Images

The $4 trillion economic cost of not vaccinating the entire world

The world’s most advanced economies will incur half the total costs associated with a failure to vaccinate poorer nations, which could exceed $4 trillion if only half their citizens are inoculated.
Masks work only if they fit well, and wearing two can ensure a tight fit. Eduardo Maquilón/Getty Images/Stringer via Getty Images News

CDC says masks must fit tightly – and two are better than one

How well your mask works depends on how well it fits. Wearing two snug masks made of different materials offers 95% protection from exposure to aerosols that could contain the coronavirus.
The pandemic blew up some carefully constructed ‘polycules.’ Bilyana Stoyanovska/EyeEm via Getty Images

Polyamorous relationships under severe strain during the pandemic

For single people, finding at least one partner has been hard enough. But for those used to juggling multiple relationships, the pandemic has forced them to rethink dating altogether.
Medical students’ backgrounds often reflect the diversity of local communities, which can allow them more access and trust for vaccination efforts. Bryan Goodchild/UMass Medical School

We’re building a vaccine corps of medical and nursing students – they could transform how we reach underserved areas

One university is showing how the vaccine corps concept can speed up vaccination rates, including launching a large-scale vaccination site staffed by hundreds of students and volunteers.
Los sensores de temperatura de infrarrojos permiten medir la temperatura sin tocar a la persona. AP Photo/LM Otero

Sensores: así monitorean nuestros cuerpos y todo el mundo

Hay sensores por todas partes. Están en puertas automáticas, en cajas registradoras, en consultorios médicos y hospitales. Se utilizan por dentro y por fuera del cuerpo.
Jeff Bezos and MacKenzie Scott, seen here before they divorced in 2019, were the top two U.S. charitable donors the following year. Jorg Carstensen/dpa/AFP via Getty Images

What the $25 billion the biggest US donors gave in 2020 says about high-dollar charity today

While support for social services and historically black colleges and universities rose sharply, these donors spent a tiny fraction of what the government distributed to people who needed help.