Getting old is an unavoidable truth of life. And yet, for most of modern history this mortal coil has baffled scientists. Over the past decade, however, researchers have made great strides in understanding the cellular, molecular, and genetic tableau of aging—which has brought the next question into sharp focus: Can aging be stopped?

Extra dimensions of space — the idea that we are immersed in hyperspace — may be key to explaining the fundamental nature of the universe. Relativity introduced time as the fourth dimension, and Einstein’s subsequent work envisioned more dimensions still — but ultimately hit a dead end.

In 1935, Albert Einstein and two colleagues published a landmark paper revealing that quantum mechanics allows widely separated objects to influence one another, even though nothing travels between them. Einstein called it spooky and rejected the idea, arguing instead that it exposed a major deficiency in the quantum theory.

Nobel Prize-winning physicist Steven Weinberg spoke about science and history, drawing from his book “To Explain the World: The Discovery of Modern Science.”

#YourDailyEquation with Brian Greene offers brief and breezy discussions of the most pivotal equations of the ages. Even if your math is a bit rusty, these accessible and exciting stories …

A second doesn’t always feel like a second—time can seem to slow down if you’re riding a death-defying roller coaster, or speed up while you’re having a night out on the town. But just what’s going on inside our heads to skew our perception of time?