[s4e10] The Alien Parasite Hypothesis Link

Sheldon’s preferred theory, as he finds it more plausible than the final option.

Sheldon famously declares 73 the "best number". It is the 21st prime number. Its mirror (37) is the 12th prime. In binary, it's a palindrome: 1001001 . [S4E10] The Alien Parasite Hypothesis

Amy informs Penny that the iconic heart shape is actually based on the shape of a female’s buttocks when bending over. The Alien Parasite Hypothesis | The Big Bang Theory Wiki Sheldon’s preferred theory, as he finds it more

Amy attempts to satisfy her urges by approaching Zack, telling him she is "130 pounds of raging estrogen" longing to "make Shakespeare's metaphorical Beast with Two Backs". Sheldon’s preferred theory

The "cold, harsh truth" they eventually accept. Iconic Moments & Quotes