Hacker News on 25 July 2018

• Liquid water 'lake' revealed on Mars
• Zotero: An open-source tool to help collect, organize, cite, and share research
• Facebook stock drops more than 20% after revenue forecast misses
• The secret call to Andy Grove that may have helped Apple buy NeXT
• Learn how to write an emulator
• Elixir v1.7 released
• Ten years left to redesign lithium-ion batteries?
• Removing jQuery from GitHub.com frontend
• Ask HN: Where can one learn about the history of the internet and the protocols?
• Google Unveils Titan Security Key, a Yubico-Like Phishing Resistant 2FA Device