On Aug. 30, 1916, on his fourth attempt, explorer Ernest Shackelton successfully returned to Elephant Island in Antarctica to rescue 22 of his stranded crew members, who had survived on the barren island for four and a half months after the sinking of their ship, the Endurance.

Outer space has emerged as the world's next battlefield, demonstrated by recent cyberattacks on satellites blamed on Russia. National security officials have said the Kremlin also is seeking to develop a space-based weapon that could knock out American satellites, potentially devastating the U.S. economy while leaving the country vulnerable to military attack. Officials in Washington are taking notice, investing in greater efforts to defend U.S. satellites while countering threats from China and Russia. One example is the U.S. Space Force, created in 2019 and tasked with protecting American interests in space.

On May 7, 1915, a German U-boat torpedoed and sank the British liner RMS Lusitania off the southern coast of Ireland, killing 1,198 people, including 128 Americans, out of the nearly 2,000 on board.

China appears to be keeping its distance as Russia and North Korea move closer to each other with a new defense pact that could tilt the balance of power among the three authoritarian states. Experts say Chinese leaders are likely fretting over a potential loss of influence over North Korea and how that could increase instability on the Korean Peninsula. Beijing so far has not commented on the deal and only reiterated boilerplate statements that it seeks to uphold peace and stability on the Korean Peninsula and advance a political settlement of the North-South divide.