On September 17, 2026, Tsinghua professor and Zhipu/GLM founder and chief scientist Tang Jie gave the first session of his newly reworked Advanced Machine Learning course.
The assigned classroom held 112 people and overflowed, with students standing in the aisles...
Course repo, if interested (in Chinese🤷♂️)
If you're heading out and the network is restricted or overloaded, WhatsApp and Signal won't work. You need a mesh messaging app. These apps use your phone's Bluetooth to bounce encrypted messages from phone to phone, creating an invisible network out of the people around you. Here is what you should download (make sure to do this before you leave Wi-Fi!):
1. Bridgefy Why use it: It's built specifically for large crowds and has been heavily used in global protests for years.
Useful features: It uses Bluetooth to connect directly with users within about 330 feet (100 meters). If the person you are messaging is further away, the app silently hops the message through other users' phones until it reaches its destination.
Where to get it: Free on the iOS App Store and Google Play Store.
2. BitChat Why use it: It is designed with extreme privacy in mind. There is no central server, and it requires no phone number or registration, which is crucial if you need to stay anonymous.
Useful features: Uses Bluetooth Low Energy (BLE) to automatically build a local mesh network. It also features a built-in panic mode that instantly erases all stored data on the app if you tap the logo three times.
Where to get it: Free on the iOS App Store and Google Play Store.
3. Meshtastic (For Organizers) Why use it: If you need to coordinate across the entire city, Bluetooth won't cut it. Meshtastic gives you miles of range.
Useful features: Completely decentralized, long-range, encrypted text communication that is virtually impossible to shut down.
Where to get it: The app is free on iOS and Android, but it requires pairing your phone via Bluetooth to a separate, inexpensive LoRa (Long Range) radio device to transmit the signal.
Important Tip: For phone-only apps like Bridgefy and BitChat to work effectively, you need a high density of users. The network is only as strong as the number of phones acting as relays. Tell everyone in your group to agree on and download the same app before heading out! Stay safe.
GHCP pricing model was never sustainable. Crying about it won't help.
Anyone offering GHCP like pricing will also end up going this route once they have enough users.
Ask for a refund. Details here: https://docs.github.com/en/copilot/concepts/billing/billing-for-individuals