Kunal Sood, MD on Instagram: "Superfetation is the extremely rare situation where a second pregnancy begins during an ongoing one. Normally, pregnancy blocks this through three layers of protection: ovulation stops, cervical mucus thickens into a plug that prevents sperm from entering, and the uterine lining becomes unreceptive to a new embryo. For another conception to occur, all three of these safeguards would need to be bypassed. Documented human cases are very few, and most involve assisted

Nature Geography on Instagram: "Giant Siberian tigers can see any living creature as prey. They are known as the most ferocious and powerful cats. They also see humans as prey and will hunt them if they get the chance. In this video, they are trying to hunt a woman who is adjusting the trunk of her car during a picnic. The woman notices the tiger early and escapes by getting into the trunk. #tiger #sibirian #wildcats #weographic #naturegeography"

Terrifying on Instagram: "In 1934, audiences at a British circus witnessed an astonishing and unsettling stunt. A live lion was taken for a ride on the Wall of Death, a vertical wooden arena typically used for daring motorcycle and car acts. The big cat, visibly restrained, was perched on the side of a car as it roared at full speed around the circular wall, forcing the animal to endure the terrifying motion. At the time, such acts were marketed as the pinnacle of thrilling entertainment, showca