Prompt: Latest technology news summary

In technology news, we see the launch of a new messaging app called Signal. It’s designed to protect users’ privacy, and is free to download on both Android and iOS. We also see the launch of the OnePlus 6T, a new phone from the OnePlus division of OnePlus. The OnePlus 6T has a new design with an all-screen display, and is available in 6 different colors. In science news, we see the first test of a new 3D printing technology that uses biodegradable materials.