Transportation

 Here in the US, the Department of Homeland Security (DHS) has erected more than 650 miles of fence and other types of barrier along the almost 2,000-mile US-Mexico border. Even before President Donald Trump took office, federal law required the barrier to be expanded by another almost 50 miles. In December, DHS announced that it had completed most of a $292 million project to build 40 miles of steel wall to replace “an outdated and operationally ineffective barrier” in the San Diego, El Centro and El Paso sectors of the border. Lawmakers have until Feb. 15 to reach a compromise on a new border security plan or there could be another government shutdown. more »

Brain scientists and pharmacologists don’t know how to measure if and to what extent marijuana causes impairment. Existing blood and urine tests can detect marijuana use, but, because traces of the drug stay in the human body for a long time, those tests can’t specify whether the use occurred earlier that day or that month. They also don’t indicate the level at which a driver would be considered “under the influence.” “It’s a really hard problem,” said Keith Humphreys, a psychiatry professor and drug policy expert at Stanford University. “We don’t really have good evidence — even if we know someone has been using — [to gauge] what their level of impairment is.” more »

Previous missions to Mars have investigated the surface history of the Red Planet by examining features like canyons, volcanoes, rocks and soil. However, signatures of the planet's formation can only be found by sensing and studying its "vital signs" far below the surface. In comparison to the other terrestrial planets, Mars is neither too big nor too small. This means that it preserves the record of its formation and can give us insight into how the terrestrial planets formed. It is the perfect laboratory from which to study the formation and evolution of rocky planets. Scientists know that Mars has low levels of geological activity. But a lander like InSight can also reveal just how active Mars really is. more »

Rose Madeline Mula wrote: Shakespeare was wrong, by the way. “To be or not to be?” is not the question — especially for a Catholic, like me, for whom “not to be” — i.e., suicide — is not an option. No, the real question is “To drive or not to drive?” If I can hold out until self-driving cars are readily available, that could solve my problem. Hurry up, technology! more »