"Half shafts" refers to the two long metal rods that connect the engine of a car to its wheels. They transmit power from the engine to the wheels, allowing the vehicle to move. Full definition
On rear wheel drive vehicles the speed sensor may be found on the output shaft of the transmission or located within the rear differential. (yourmechanic.com)
You can even see the drive shaft in action if you choose to drive a truck without a bed on it. (xboxgamerreviews.com)
These omega - 3s are a necessary component of hair shaft growth, which will keep your scalp oils hydrated as well. (mindbodygreen.com)