In principle, anyone can sign up and participate. You'll need to verify your email address and phone number before you can take part.
AT, AU, BE, CA, CH, CL, CZ, DE, DK, EE, ES, FI, FR, GB, GR, HU, IE, IL, IS, IT, JP, KR, LU, LV, MX, NL, NO, NZ, PL, PT, SE, SI, and US.
However, it's possible we'll have to continue to modify this list.
Please note that many studies have eligibility criteria. This means that sometimes only certain demographics are required (e.g. 20-30 year old female Astrophysics students from Germany, to give one example).
If you are not eligible for currently available studies, then we kindly ask for your patience. New studies are posted regularly.