Marcelo Rocha

a origem do utf-8

The Dance of Mars and Jupiter...

Best physics teachers

When engineering hits absolutely zero tolerance.

How to geometrically draw a perfect egg [🥚 nakkageoart]

Euler's formula.

@joaopedro Se não é de rico ou de pobre, é de quem quiser fazer kkkkk

@MarceloRocFer Não era “de rico” mas definitivamente não era de pobre. Tatuagem bem feita sempre foi algo mto caro

Tatuagem virou coisa de pobre. Tá todo mundo tirando. Engraçado ver como a moda é cíclica.

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o dev que criou o java

A senior Google engineer just dropped a 421-page doc called Agentic Design Patterns. Every chapter is code-backed and covers the frontier of AI systems: → Prompt chaining, routing, memory → MCP & multi-agent coordination → Guardrails, reasoning, planning This isn’t a blog post. It’s a curriculum. And it’s free.

@techxutkarsh Could you send it to me, please?

Authentication & Authorization (OAuth, JWT, Sessions) What is Authentication? Authentication is the process of verifying the identity of a user or system. It ensures that the person or application trying to access a system is who they claim to be. → Example: Logging in with a username and password. What is Authorization? Authorization determines what an authenticated user is allowed to do within a system. It defines permissions and access levels. → Example: A normal user can view content, while an admin can add or delete content. OAuth (Open Authorization) → A standard protocol for token-based authentication and authorization. → Allows users to log in using third-party providers like Google, Facebook, or GitHub. → Example: "Log in with Google" button on websites. JWT (JSON Web Token) → A compact, secure token format used for authentication. → Contains encoded user information and is signed to ensure integrity. → Commonly used in stateless authentication, where the server doesn’t store session data. → Example: After logging in, the server issues a JWT that the client sends with every request. Sessions → A method where the server stores user authentication data temporarily. → A session ID is stored in the client’s browser (cookie) and mapped to server-side data. → Example: Traditional web apps where a user stays logged in until the session expires or they log out. Key Differences → OAuth: Delegates authentication to external providers. → JWT: Stateless authentication with tokens stored on the client. → Sessions: Stateful authentication with data stored on the server. Real-World Examples → OAuth: Logging into Spotify using Facebook or Google. → JWT: APIs where clients authenticate using tokens. → Sessions: Classic PHP or Node.js web apps with login systems.

Why this metal behaves like rubber?

This is beautiful

a primeira mente digital da história

Physics

This is how the binary system works, explained with an ingenious wooden counter.

Quando Gauss tinha 10 anos e frequentava a escola primária, sua professora pediu à turma que somasse todos os números de 1 a 100. Poucos instantes depois, o jovem Gauss levantou a mão e gritou a resposta, enquanto os outros alunos começavam a somar os números, um por um, meticulosamente. Como ele chegou à resposta tão rápido? O jovem Gauss percebeu que a sequência podia ser dividida em pares: o primeiro número, 1, com o último número, 100; o segundo número, 2, com o penúltimo número, 99; e assim por diante. A soma de cada par seria 101. Percebendo que havia 50 pares no total, Gauss multiplicou 50 por 101 para obter a soma da sequência. O resultado, 5050, surgiu em sua mente quase instantaneamente.

@HildurArnar1 @mariajan786 @MithilaWeb3 The pattern can also be: (x^2) * 2. (5^2) * 2; 25 * 2; Answer 50.

@mariajan786 @MithilaWeb3 so 1+1=2 1x2=2 2+2=4 2x4=8 3+3=6 3x6=18 4+4=8 4x8=32 5+5=10 5x10=50 So 50

Looks easy .. isn't Only 1% get this