[Tomas] wanted to try building something mechanical with electronic control, and ended up with this sorter that organizes beads into one of two containers based on color. He built most of the ...

[Editor's note: this is the second installment in a relatively large project. The engineering challenge faced by these students was to create a talking color detector. I've elected to print the entire ...

An inexpensive detector developed by a NASA-led team can now see invisible infrared light in a range of "colors," or wavelengths. The detector, called a Quantum Well Infrared Photodetector (QWIP) ...