产品设计

Group Scheduling Simplified Discussion | Link

While there was probably a moment when Slate’s leadership had to green-light the switch from one battery type to another, the momentum toward that decision had been building for years.

If you have a half-decent internet connection, you can probably turn "Data Saver" off.

A distraction-free breathing app for labor preparation Discussion | Link

Victim's family files wrongful death suit following Tesla crash in Texas.

When designing systems like Facebook, WhatsApp, Netflix, Amazon, or Instagram, one of the first questions a system designer asks is: Can a single server handle the traffic? How much storage will be needed? Do we need caching? How much RAM should our cache have? How many servers should we deploy? Before discussing databases, load balancers, microservices, or caching layers, we need a rough understanding of the scale. This is where Back-of-the-Envelope Calculations come into the picture. Why Do We Need Back-of-the-Envelope Calculations? Imagine you're asked to design Facebook. If you immediately start drawing: Load Balancer ↓ Application Servers ↓ Redis Cache ↓ Database without knowing the expected traffic, you're designing blindly. System design is fundamentally about making trade-offs. To make those trade-offs, we first need estimates. Back-of-the-envelope calculations help us answer: How much traffic will the system receive? How much data will be generated? How much cache memory is required? How many servers are needed? The numbers don't need to be perfect. They only need to be close enough to make architectural decisions. What Exactly Is a Back-of-the-Envelope Calculation? A quick estimation technique used to approximate: Traffic Storage Memory Server Capacity using rough assumptions. Think of it as: "Getting the order of magnitude correct rather than getting the exact number correct." A system designer rarely needs perfect accuracy during interviews. They need reasonable estimates. The Standard Estimation Flow Whenever you get a System Design question: Users ↓ Traffic ↓ Storage ↓ RAM / Cache ↓ Number of Servers ↓ Architecture Design Always estimate first. Design later. The Ultimate Estimation Cheat Sheet Storage Units Unit Value 1 KB 10³ Bytes 1 MB 10⁶ Bytes 1 GB 10⁹ Bytes 1 TB 10¹² Bytes 1 PB 10¹⁵ Bytes Time Units Unit Value 1 Minute 60 Seconds 1 Hour 3600 Seconds 1 Day 86,400 Seconds Common Assumptions Metric Approximation Peak Traffic 3× Average Traffic Active

There are an overwhelming number of Prime Day deals to sort through, which is why we spend so much time highlighting products we’ve already tested and can stand behind. But our recommendations are only one way to identify a worthwhile deal: another is seeing which products fellow Verge readers actually buy. Below, we’ve rounded up […]

Branches received exceptions to Hegseth's policy that made the shot optional.

Build agents & apps on top of your context with one prompt. Discussion | Link

https://investor.qualcomm.com/news-events/press-releases/new... https://www.modular.com/blog/qualcomm-to-acquire-modular https://x.com/clattner_llvm/status/2069769232477192354 , https://xcancel.com/clattner_llvm/status/2069769232477192354

Find the city where everyone's flights are cheapest Discussion | Link

Lossless media compression without context switching Discussion | Link

Dyson’s PencilWash cordless hard floor cleaner is on sale for $199.99 ($150 off) at Amazon. This is the lowest price yet for the powered wet mop that’s a cousin to the silly-sounding-but-awesome Dyson PencilVac Fluffycones vacuum. The PencilWash basically takes the sleek styling and design of the PencilVac and simplifies it into a single-purpose electric […]