Here’s a concise summary of the top five global tech highlights from February 21, 2025:

1. **2025 Global Developers Conference (GDC) Opens in Shanghai**  

2. **Apple Launches iPhone 16e with First Self-Developed 5G Modem**  

3. **Breakthrough in Pure Red Perovskite LED Technology**  
   Chinese Academy of Sciences developed a stable pure red perovskite LED, addressing a global challenge in ultra-high-definition display technology. 

4. **Bybit Exchange Suffers $1.5 Billion Hack**  
   Cryptocurrency exchange Bybit was hacked, resulting in the theft of over $1.5 billion worth of ETH and stETH. The incident caused a market-wide downturn, with Bitcoin dropping below $95,000 and Ethereum falling by 6.7% within 24 hours.

5. **U.S. Crypto Stocks Rise Amid Market Volatility**  
   Despite the Bybit hack, U.S. cryptocurrency-related stocks saw gains, with Coinbase rising 3.64%, Strategy up 1.52%, and Riot Platforms increasing by 1.47%.