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Amazon’s Kindle Write On author community, billed as a “story lab” for authors to test ideas and get feedback from readers, will be closing on March 22, the company informed members of the community today.

Among the 750 volunteers, 520 are students from Wuxi Taihu University, and 170 are from the local government. The rest are 30 emergency rescuers, 20 interpreters and 10 photographers. They are spread across 45 posts.

Amesh Adalja, an infectious-disease expert at the Johns Hopkins Center for Health Security, agreed.

Amazon’s investment follows its product announcements last week that included a new Alexa-enabled microwave, clock, and audio-related devices for the home as the tech giant aims to get its voice platform everywhere. Earlier this year, it paid a reported billion to acquire home security company Ring.

Amazon’s announcement?confirms a report by The Information news site last month.