Google publishes fonts for material which you can use in your applications and websites for free. The fonts are here https://fonts.google.com/icons?icon.platform=android You can use these by

I love Gradle as a build tool, it's so much nicer than Maven, XML is so 20th century. However, there are things about it I don't like, for example,

Happy Eyeballs is an RFC defined by the IETF and is (according to Wikipedia) an algorithm published by the IETF that makes dual-stack applications (those that understand both IPv4 and IPv6) more responsive