The short version
Students need a chance to test an idea, compare evidence, and explain why one fact matters while another one does not. That is where Critical Thinking Online Breakouts, or CTOBs, fit nicely
The science CTOBs for grades 3, 4, and 5 are free, browser-based activities. Each grade includes a featured breakout, a related STEM challenge, a picture word bank, Skills and TEKS support, teacher supports, and a password-protected answer key. The grade pages also note that the activities run in the browser and include seven languages. You may have seen the CTOBs for grades kindergarten, first, and second.