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Cash is pretty convenient. Dilok Klaisataporn/EyeEm via Getty Images

Why does money exist?

Paying for the stuff you want with currency is way easier than relying on chairs you made or chickens you raised.
Some of the positive photos used in the study were similar to this one – a group of smiling strangers. Luis Alvarez/DigitalVision via Getty Images

Ketamine paired with looking at smiling faces to build positive associations holds promise for helping people with treatment-resistant depression

In a new study, a single infusion of the antidepressant – along with repeated exposure to positive imagery – significantly reduced symptoms in depressed patients in a clinical trial.
Blockchain transactions are carried in blocks. The amount of energy it takes to add a new block varies widely depending on how it’s done. Yuichiro Chino/Moment via Getty Images

What is proof-of-stake? A computer scientist explains a new way to make cryptocurrencies, NFTs and metaverse transactions

Ethereum, one of the world’s largest blockchains and host of decentralized finance, NFTs and billions of dollars’ worth of cryptocurrency, is poised to dramatically reduce its energy consumption.
Students who are career-driven tend to do better academically. Morsa Images via Getty Images

Purpose and gratitude boost academic engagement

College students who are focused on career goals and personal growth – and growth for others – tend to fare better academically, new research finds.
A self-managed abortion is the termination of pregnancy outside the formal health care system, often with self-sourced abortion pills. Liudmila Chernetska/iStock via Getty Images Plus

When abortion at a clinic is not available, 1 in 3 pregnant people say they will do something on their own to end the pregnancy

The fall of Roe v. Wade will result in more people deciding to privately end a pregnancy, a new study finds. But how often people will turn to safe versus unsafe options remains to be seen.
Psychologists aren’t sure which factors drive students to form specific academic identities, but these identities can affect career choices. Tom Werner/DigitalVision via GettyImages

Students perceive themselves as a ‘math person’ or a ‘reading person’ early on – and this can impact the choices they make throughout their lives

Students are less likely to think they can be good at both math and reading as they get closer to high school.
Saying you feel a strong national allegiance doesn’t mean you will act accordingly. mikiell/iStock via Getty Images Plus

Conservatives and liberals are equally likely to fund local causes, but liberals are more apt to also donate to national and global groups – new research

An experiment conducted online with residents of Italy and the US detected similar patterns based on ideological identity.
U.S. banana growers heavily influenced several Central American governments in the early 20th century. George Rinhart/Getty Images

What’s a banana republic? A political scientist explains

The US grows hardly any tropical fruit. So why are politicians and political commentators saying the country is at risk of devolving into a banana republic?

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