Smart Concrete Could Pave the Way for High-Tech, Cost-Effective Roads Of the 614,387 bridges in the US, for example, 39 percent are older than their designed lifetimes .......... The cost to repair and improve nationwide transportation infrastructure ranges from nearly US$190 billion to almost $1 trillion. ......... These new systems self-monitor the condition of roads and bridges quickly and accurately and can, sometimes, even repair themselves. ............. At an early stage of a crack, for example, self-healing pavement would activate super absorbent polymers to absorb water and produce concrete-like material that fills in the crack. Cracks as small as a few microns could be healed to prevent significant damage by preventing or delaying the later stages of the freeze-thaw cycle.
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This Coronavirus Surge Does Not Have to Be So Horrific America is entering a difficult period. But the outcome is not foregone. ........... The nation is entering its third, and potentially most dreadful, coronavirus surge. Earlier this month, the daily nationwide case count reached 100,000 for the first time. On Thursday it passed the 160,000 mark. Hospitalizations are at their highest point yet. Unlike previous surges, there is no epicenter. The virus is spreading everywhere. ............ Death isn’t the only bad outcome of contracting the coronavirus. Debilitating symptoms can last for months, and some doctors worry they may lead to permanent disability. Also, lower death rates are contingent on a high standard of care, which will be difficult to maintain across the country as case counts grow. In any case, death tolls are a lagging indicator. ................. “It’s like we survived the Titanic............Now we’re looking at the tip of an iceberg and pretending that the tip is the whole thing.” ........... If Americans want to get the current surge under control through this long, dark winter, they need to skip indoor gatherings, including for the holidays. They need to avoid nonessential travel. They must wear face masks in all public places. They all need to practice social distancing. They need to quarantine when they think they’ve been exposed to the virus and isolate if they get a positive test result, even if no symptoms emerge.
Here’s How Trump’s Stalling Risks Our National Security I’ve seen my share of presidential transitions. The administration hurts the country by not cooperating with President-elect Biden. ........... Tragically, but not surprisingly, Mr. Trump appears determined to take a final wrecking ball to our democracy and national security on his inevitable way out the door.
China-Led Trade Pact Is Signed, in Challenge to U.S. The deal sealed on Sunday stands as a potent symbol of Beijing’s growing economic sway in Southeast Asia at a time of uncertainty over Washington’s economic ties with the region.
Before ‘I Have a Dream,’ Martin Luther King Almost Died. This Man Saved Him. The untold story of the patrolman who took charge when the civil rights leader was stabbed in Harlem.
Economic Demands Test Biden Even Before Inauguration With the recovery slowing and coronavirus cases surging, Democrats must decide whether quick action on federal aid is more important than its scale.
Newton’s Daunting Masterpiece Had a Surprisingly Wide Audience, Historians Find The discovery suggests that “Principia” had a stronger impact on Enlightenment science than previous research suggested............ It had a reputation for unreadability. ......... First editions of the Principia, the scholars say, today sell for between $300,000 and $3,000,000 on the black market and at auction houses such as Christie’s and Sotheby’s. They estimate that the book’s first edition consisted of some 600 and possibly as many as 750 copies — hundreds more than the 250 or so that historians had previously assumed.
