Over the past decades, engineers have introduced numerous technologies that rely on light and its underlying characteristics. These include photonic and quantum systems that could advance imaging, ...

A pulse oximeter measures blood oxygen levels at home and in healthcare settings. Abnormally low readings on a pulse oximeter might require medical care, especially if they are below 92%. Skin color ...

Sleeping on the left side can help align the spine and reduce acid reflux. Back sleeping keeps the spine aligned but may worsen sleep apnea and snoring. Right-sided sleeping may improve heart health ...