Mod (from modernist) is a subculture that originated in London, England, in the late 1950s and peaked in the early-to-mid 1960s.[1][2][3]

Significant elements of the mod subculture include fashion (often tailor-made suits); music, including African American soul, Jamaican ska, British beat music, and R&B; and motor scooters. The original mod scene was also associated with amphetamine-fuelled all-night dancing at clubs.[4] From the mid-to-late 1960s and onwards, the mass media often used the term mod in a wider sense to describe anything that was believed to be popular, fashionable, or modern.

There was a mod revival in the United Kingdom in the late 1970s, which was followed by a mod revival in North America in the early 1980s, particularly in Southern California.[5][6]

1 + 1 = 0 in binary. Why does this happen?

Note: Adding binary numbers is related to modulo 2 arithmetic.

Let's review mod and modular arithmetic with addition.

modulus 2 is the mathematical term that is the remainder from the quotient of any term and 2. For instance, if we have 3 mod 2, then we have 3 / 2 = 1 + ½. The remainder is 1. So 3 ≡ 1 mod 2.

What if we want to add moduli?

The general form is a mod n + b mod n ≡ (a + b) mod n.

Now, for the given problem, 1 mod 2 + 1 mod 2 ≡ 2 mod 2. Then, 2 mod 2 ≡ 0 mod 2.

Therefore, 1 + 1 = 0 in binary.