Smartphones come with many physical sensors. Laptops are bigger and have more power, so they should have just as many.

- Very good quality cameras front and back, including IR, dot projector and flash

- Analog audio I/O

- GPS receiver

- 3D accelerometer and gyroscope

- Magnetometer

- Ambient light level and color temperature

- Ambient temperature, air pressure, hygrometer

- Radiation detector

- Wasn't there some research into a user-facing radar that could detect gestures?

- GPIO and SDR