[Answer] Cousin Oliver was a late addition to which family sitcom?

Step 1 : Introduction to the question "Cousin Oliver was a late addition to which family sitcom?"

...Cousin Oliver was introduced during the final season of The Brady Bunch as a last-ditch effort to inject new energy into the series after ratings began to slip and the original child cast grew older. Played by Robbie Rist, the character was meant to recreate the show’s early charm but instead became an example of an ill-received late addition. His legacy lives on through the phrase “Cousin Oliver Syndrome,” now used to describe sitcoms that awkwardly add a young child character in hopes of extending their run—often with the opposite effect.

[Answer] Anne Frank wrote her famous diary entries in the form of letters addressed to which name?

Step 1 : Introduction to the question "Anne Frank wrote her famous diary entries in the form of letters addressed to which name?"

...In 1942, Anne Frank, a young Jewish girl living in Amsterdam, received a diary as a gift from her parents on her 13th birthday. A month later, she and her family went into hiding from the Nazis in rooms behind her father’s office. While hiding, Anne decided to think of her diary as a friend, whom she named Kitty. Frank's diary entries often started with a salutation, usually addressed to "Kitty." So who was Kitty? Some say Kitty was an imaginary friend, while other scholars believe that Anne borrowed the name from her favorite book series, Joop ter Heul, in which the title character’s best friend was named Kitty Francken.

[Answer] Which Beatles song is about John Lennon’s mother?

Step 1 : Introduction to the question "Which Beatles song is about John Lennon’s mother?"

...John Lennon wrote the song "Julia" as a tribute to his mother, Julia Lennon, who was tragically killed by a drunk driver when Lennon was just 17 years old. Featured on The White Album, the track is a gentle, intimate acoustic piece performed by Lennon alone, blending personal grief with poetic, dreamlike imagery. The lyrics reference both his childhood memories and his relationship with Yoko Ono, weaving past and present together. The song stands as one of the Beatles’ most emotionally raw recordings, offering a rare glimpse into Lennon’s private inner life.

[Answer] The largest bubblegum bubble ever blown had a diameter of 23 inches. What was the bubble’s circumference?

Step 1 : Introduction to the question "The largest bubblegum bubble ever blown had a diameter of 23 inches. What was the bubble’s circumference?"

...To calculate the circumference of a circle, you multiply the diameter by p (pi). Using the formula C = p × d, a bubble with a 23-inch diameter has a circumference of approximately 72.2 inches (23 × 3.14). This record-setting bubble was blown by Susan Montgomery Williams in 2004 and is officially recognized by Guinness World Records. At more than six feet around, the bubble’s size underscores just how remarkable the achievement was, adding a playful mathematical twist to one of the most stickiest and unusual records in trivia history.

[Answer] Which animals were used in psychological experiments by Pavlov?

Step 1 : Introduction to the question "Which animals were used in psychological experiments by Pavlov?"

...Ivan Pavlov’s groundbreaking experiments were conducted on dogs, which he used to study conditioned reflexes. While researching digestion, Pavlov observed that dogs would begin to salivate not only when food was presented, but also when they heard sounds associated with feeding, such as footsteps or bells. By repeatedly pairing a neutral stimulus with food, he demonstrated how animals could be trained to respond automatically—an insight known as classical conditioning that helped lay the foundation for modern psychology and behavioral science.