Signal app explained, UPenn research warning, Wall Street bonuses & more

We’ll take a closer look at the message app at the center of the Trump administration’s group chat controversy. US Intelligence says drug cartels are one of the biggest threats to the US. South Korean wildfires have killed dozens of people. The University of Pennsylvania says lifesaving research is in jeopardy after its funding was cut. Plus, it’s been a record bonus season for Wall Street.

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