The Way to Go in Space

The RAAS Pathway

Spacecraft Design

Space Tethers

Roton Vehicle

Reaching for the Stars

Rates of a Particular Gene Variant: 235T

Light Sails

Ion Engine

Highways of Light

High Blood Pressure and the Slave Trade

Compact Nuclear Rockets

Body Mass Index

Air-Breathing Engines

The Way to Go in Space

To go farther into space, humans will first have to figure out how to get there cheaply and more efficiently. Ideas are not in short supply

What Pressure Readings Mean

The Puzzle of Hypertension in African-Americans

Genes are often invoked to account for why high blood pressure is so common among African-Americans. Yet the rates are low in Africans. This discrepancy demonstrates how genes and the environment interact

Incidence of Hypertension

THE INTERIORS AND MAGNETIC FIELDS OF GALILEAN SATELLITES

THE INFERNAL MOON

THE GAS GIANT

POCKMARKED CALLISTO

Supersoft X-ray Stars and Supernovae

Several years ago astronomers came across a new type of star that spews out unusually low energy x-rays. These so-called supersoft sources are now thought to be white dwarf stars that cannibalize their stellar companions and then, in many cases, explode

A Multifractal Walk down Wall Street

The geometry that describes the shape of coastlines and the patterns of galaxies also elucidates how stock prices soar and plummet

How Limbs Develop

A protein playfully named Sonic hedgehog is one of the long-sought factors that dictate the pattern of limb development