But they ran into problems, when they launched their Neptune 2 rocket,

"Our rocket exploded, and we didn't know why, we needed a data logger …"

and because they're makers, and all the data loggers they could find were too expensive or just not right for the job, they went ahead and built their own.

Their Apollo board is less than two square inches in size and is packed with sensors — eleven of them.

"We called it Apollo, because it has eleven sensors …"

The tiny six-layer board has an accelerometer, gyroscope, magnetometer, and GPS, and can measure temperature, pressure, humidity, light (both UV and IR), and it records audio. But the board also comes with Bluetooth LE and wi-fi onboard, an SD Card for logging data locally, LiPo battery management circuitry, and it has an OLED screen and a vibrating trackball. If you count them up, the Apollo has over 200 components, all packed onto that tiny two-square-inch board.