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Doctors are a step closer to being able to use a simple blood draw to help confirm an Alzheimer's disease diagnosis. The Food and Drug Administration has announced that it has cleared a new test from Roche that employs a single protein in the blood as a marker for amyloid plaque in the brain, long tied to Alzheimer's, the Washington Post reports.

Canada will announce retaliatory tariffs against the United States on Tuesday, sources tell the CBC and the AP, escalating a trade fight that has sharply worsened since negotiations with the Trump administration collapsed. Prime Minister Mark Carney said Monday that Canada may need to move away from matching US tariffs dollar for dollar and instead use more targeted retaliation aimed at protecting Canadian workers and businesses.

Nevada turned to the courts on Monday in a bid to keep more of the Colorado River flowing its way. The state sued the federal government, asking a US District Court to halt a Bureau of Reclamation plan that would sharply reduce water deliveries to Nevada, California, and Arizona over the next decade if the river keeps shrinking, the New York Times reports.

Standing beneath the spreading branches of a massive live oak, historian Garrison Marcoux tries to imagine what this scarred, struggling tree saw 245 years ago. Did one of the British soldiers encamped at this South Carolina crossroad near the end of the Revolutionary War sit in the oak's shade to recuperate from the series of attacks in American Maj. Gen. Nathanael Greene's "war of posts?" Perhaps a soldier took his last breath beneath its canopy, watering its roots with his blood.

A federal judge on Monday postponed a trial in the US for a former Libyan intelligence official charged in the 1988 bombing of Pan Am Flight 103, citing the discovery of new evidence that defense attorneys want to examine in the nearly 40-year-old case. Jury selection was scheduled to begin Wednesday for the federal trial of Abu Agila Mohammad Mas'ud Kheir Al-Marimi in Washington, DC, the AP reports. His trial will be the first in the US for the Dec. 21, 1988, bombing over Scotland.

Snake Beats Cancer With Groundbreaking Treatment A 15-foot cancer patient at England's Chester Zoo just made medical history—by being a snake. Jodie Foster, a roughly 110-pound reticulated python whose name was inspired by the initials "JF," for juvenile female, on her intake form, became the first known snake treated with electrochemotherapy after a jaw tumor made eating increasingly difficult, Smithsonian reports.

Job hunters burned by listings that go nowhere may soon have lawmakers on their side. The Wall Street Journal reports that "ghost jobs"—openings posted online with little or no intention of actually hiring—may account for nearly one in five digital job ads, according to hiring platform Greenhouse. Frustration over those phantom postings has moved from Reddit threads to state capitols.

Crews have started to contain a wildfire in the Sierra Nevada foothills near Reno, Nevada, that destroyed more than 30 homes as it spread perilously close to dense neighborhoods, officials said Monday. Containment reached 27%, and there was no new growth of the Hawk Fire, which has held steady at about 23 square miles since Sunday, authorities said at an afternoon news briefing, the AP reports. "We are making progress," said US Forest Service District Ranger Matt Zumstein.

Americans will be paying more for fake beards and plywood, now that President Trump has imposed 50% tariffs on roughly $20 billion of Canadian exports. The tariffs will be on top of existing duties on aluminum, steel, autos, and lumber. The sweeping new list of good affected are oddly specific, the New York Times reports: precisely 36 kinds of plywood, bedroom furniture "not designed for motor vehicle use," and a clothing including anoraks, overcoats, blazers, and dresses.

The Supreme Court on Monday handed President Trump a partial victory on mail-in voting, but also set the stage for more legal fights before the midterms. In an unsigned order, the justices allowed parts of Trump's March executive order to move ahead, including a plan for the Department of Homeland Security to assemble state-by-state lists of people it believes are eligible to vote in 23 Democratic-led states that sued to stop the policy, CNN reports.