Red blood cells (RBCs) are responsible for transporting oxygen from the lungs to the rest of the body and returning carbon dioxide from the body to the lungs for exhalation. Details:
Red blood cells, or erythrocytes, contain hemoglobin, a protein that binds to oxygen molecules. When we inhale, oxygen enters the lungs and binds to hemoglobin in the red blood cells, which then travel through the bloodstream to deliver oxygen to various tissues. After delivering oxygen, red blood cells pick up carbon dioxide, a waste product of cellular metabolism, and transport it back to the lungs, where it is expelled from the body. RBCs are produced in the bone marrow and have a lifespan of about 120 days.

Mercury is the closest planet to the Sun and has a diameter of about 4,880 kilometers (3,032 miles), making it the smallest planet in our solar system. Its proximity to the Sun gives it extreme temperature variations, with daytime temperatures reaching up to 430°C (800°F) and nighttime temperatures plummeting to -180°C (-290°F). Despite its small size, Mercury has a significant gravitational pull, due to its dense, iron-rich core. It also lacks an atmosphere to retain heat, contributing to its drastic temperature changes.

Weightlifter Karnam Malleswari created history and became the first Indian woman to win a medal at the Olympics. During the Sydney 2000 Games, Karnam Malleswari lifted 110kg in the snatch and 130kg in the clean and jerk categories for a total of 240kg and finished the competition with a bronze medal.