Question: If dark matter does not emit or reflect any kind of light, (As I have heard from Neil deGrasse Tyson’s Cosmos series) then how come we can see [ourselves in] a mirror? – Cyrus
Answer: Scientists love to perform experiments that clear prove a fact. One interpretation of this observation is that this demonstrates that we are definitely not made of dark matter! So, simply by looking in a mirror you have proven something fundamental about the material that humans are made of. Congratulations!