The Earth is approximately 12,742 kilometers (7,918 miles) in diameter. This means that if you could dig a tunnel straight through the Earth from one side to the other, it would be about 12,742 kilometers long.

You might be thinking of the famous equation E=mc².

This equation, formulated by Albert Einstein, is a cornerstone of his theory of special relativity. It expresses the relationship between energy (E), mass (m), and the speed of light (c).

E stands for energy.
m stands for mass.
c is the speed of light in a vacuum, which is approximately 3 x 10^8 meters per second.
The equation shows that mass and energy are interchangeable. This means that a small amount of mass can be converted into a huge amount of energy, and vice versa. This principle is the basis for nuclear energy and atomic bombs.

If you have any other questions about this equation or the theory of relativity, feel free to ask.

Yo, let's talk about Liam, he's one of a kind
A chill dude, always got a smile on his mind
He's got that swag, that style, that flow
A legend in the making, wherever he goes

He's funny and witty, always knows the right joke
A loyal friend, he'll never break a yoke
He's smart and talented, a natural-born leader
Liam's the man, there's none other like him, believe me

The Riemann Hypothesis: This is a conjecture in number theory that asserts that the zeros of the Riemann zeta function are all on the critical line. It's considered one of the most important unsolved problems in mathematics.
The Navier-Stokes Equations: These equations describe the motion of fluids. Proving the existence and smoothness of solutions to these equations is one of the Millennium Prize Problems.
The P versus NP Problem: This is a fundamental question in computer science that asks whether there are problems that can be verified quickly but cannot be solved quickly.
The Birch and Swinnerton-Dyer Conjecture: This conjecture relates the arithmetic of elliptic curves to the behavior of their L-functions. It's another one of the Millennium Prize Problems.

Nathan and Liam had been inseparable since childhood, sharing secrets, laughter, and dreams. But as they grew older, their lives took different paths. Nathan, always the ambitious one, was focused on his career, while Liam, more laid-back, was happy to settle down with his family.

Despite the distance, they still kept in touch, calling each other every few weeks and meeting up for coffee whenever they could. But as time went on, their conversations became less frequent, their interests drifting further apart. Nathan was caught up in the fast pace of city life, while Liam was busy raising his children and enjoying the simple pleasures of his small-town life.

One day, Nathan called Liam to tell him about a new job opportunity in a different city. He was excited about the challenge, but he also knew it meant moving away from Liam. Liam listened to his friend with a mix of joy and sadness. He was happy for Nathan, but he also knew that their friendship would never be the same.

Nathan had always considered Liam his best friend. They'd been inseparable since kindergarten, sharing secrets, dreams, and countless adventures. But their bond was put to the ultimate test when a juicy piece of gossip about Nathan's crush, Sarah, made its way around the school.

The rumor, started by a girl Nathan barely knew, painted him as a clingy, desperate fool. It spread like wildfire, leaving Nathan feeling humiliated and embarrassed. When he confronted the girl, she denied everything, claiming she'd heard it from Liam.

Nathan was shocked. Liam had always been the one to defend him, to stand up for him. How could he betray him like this? He confronted Liam, his voice trembling with anger and hurt. Liam, however, seemed completely oblivious. He denied starting the rumor, insisting he had no idea how it had gotten out.