I’m Davan Maharaj, editor of the Los Angeles Times. The nation is rattled by another mass shooting, this time against military service members in Tennessee; and Uber gets a big lift at LAX. Here are some story lines I don’t want you to miss today.

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Carnage in Chattanooga
Another mass shooting. A dead gunman with an Arabic name. And a new wave of fear about “lone wolf” attacks. Four Marines were killed in an assault on two military sites in Chattanooga, Tennessee, before the gunman was shot dead. A motive wasn’t clear. Authorities are investigating as a terrorist attack. Here’s the latest on the attack and what we know about the suspect, by all accounts a bright and religious young college graduate.

A Pick-Me-Up for Uber
Los Angeles officials opened a huge door for ride-sharing services like Uber and Lyft, all but clearing the way for them to pick up fares at LAX. L.A. would be the biggest city to open such access to its major airport. It’s a big lift for Uber, which is beset by legal challenges around the country and the world — including some serious problems with California state regulators.

Farms vs. Fish
Congress can’t make it rain, but it’s good at starting storms. House Republicans passed a bill that would send more water to San Joaquin Valley growers by cutting water for endangered fish. Environmentalists are outraged. It won’t get to President Obama, who probably wouldn’t sign it anyway. Analysts say this merely highlights how little Congress can do about the drought.

Japan’s New Military
The U.S. took great pains to demilitarize Japan after World War II, even drafting a pacifist constitution for the country. Now, with China flexing its military muscle in the region, a doctrine of “collective self-defense” is taking hold. New legislation could allow Japanese troops to fight abroad, perhaps alongside U.S. forces. Problem is, a lot of Japanese want none of it.

India’s Epic Fail
It’s a colossal scandal even by India’s standards. Whistle-blowers say tens of millions of dollars changed hands to rig tests for exams for medical school, the holy grail of education in India. More than 1,800 people have been arrested. Now, there’s a grim twist: People linked to the scandal are dying. Take in some high crime and medical mystery in today’s Great Read.