During the citizen science month you will dicover the citizen science observatories that participate in Cos4Cloud project*. We will also recommend you the citizen science books that you must read. And we will prepare a webinar on 28th of April at 15 pm - "Let's talk about citizen observatories". *Cos4Cloud is an ambitious horizon 2020 project that will create cutting-edge technology services to improve citizen science platforms. The developed services will be tested in 9 citizen science platforms.