Shawna Bynum

Millions of people visit xkcd.com each week to read Randall Munroe's iconic webcomic. His stick-figure drawings about science, technology, language, and love have a large and passionate following. Fans of xkcd ask Munroe a lot of strange questions. What if you tried to hit a baseball pitched at 90 percent of the speed of light? How fast can you hit a speed bump while driving and live? If there were a robot apocalypse, how long would humanity last?

Whether pondering black holes or predicting discoveries at CERN, physicists believe the best theories are beautiful, natural, and elegant, and this standard separates popular theories from disposable ones. This is why, Sabine Hossenfelder argues, we have not seen a major breakthrough in the foundations of physics for more than four decades. The belief in beauty has become so dogmatic that it now conflicts with scientific objectivity: Observation has been unable to confirm mindboggling theories, like supersymmetry or grand unification, invented by physicists based on aesthetic criteria.

The Solarian League's navy counts its superdreadnoughts by the thousands. Not even its own government knows how enormous its economy truly is. And for hundreds of years, the League has borne the banner of human civilization, been the ideal to which humanity aspires in its diaspora across the galaxy. But the bureaucrats known as the "Mandarins," who rule today's League, are not the men and women who founded it so long ago. They are corrupt, venal, accountable to no one...and they've decided the upstart Star Kingdom of Manticore must be destroyed.

16 years of peace and prosperity have passed since Lord Otori Takeo united the Three Countries. Takeo and his beloved consort, Kaede, have three daughters and a happy family life. Their success has attracted the attention of the distant Emperor and his general, the warlord Saga Hideki, who covet the wealth of the Countries. Meanwhile, the violent acts and betrayals of the past will not lie buried, and other secrets will not stay hidden. Everything that Takeo and Kaede have achieved is threatened.

Six days ago, astronaut Mark Watney became one of the first people to walk on Mars. Now, he's sure he'll be the first person to die there. After a dust storm nearly kills him and forces his crew to evacuate while thinking him dead, Mark finds himself stranded and completely alone with no way to even signal Earth that he's alive - and even if he could get word out, his supplies would be gone long before a rescue could arrive. Chances are, though, he won't have time to starve to death. The damaged machinery, unforgiving environment, or plainold "human error" are much more likely to kill him first.

Rear Admiral Michelle Henke was commanding one of the ships in a force led by Honor Harrington in an all-out space battle. The odds were against the Star Kingdom forces, and they had to run. But Michelle's ship was crippled, and had to be destroyed to prevent superior Manticoran technology from falling into Havenite hands, and she and her surviving crew were taken prisoner.