The Green Flash – A rare optical phenomenon

Sunrise and Sunsets are always stunning to watch and some rare occurence during these events makes it more beauiful to watch. Yes, there is an interesting and a rare meteorological optical phenomenon called the green flash. It is a green spot or flash visible for only few seconds at the top edge of the sun…

How does a pulse oximeter work?

The pulse oximeter is a device used to measure oxygen saturation in the blood. Humans breathe oxygen in the air which enters the lungs. Then the oxygen is carried in our blood to the entire body by the hemoglobin in our red blood cells. Oxygen saturation refers to the percentage of the hemoglobin that carries…