1. The problem statement, all variables and given/known data I'm not able to identify this, i found it on my window railings. Could you help me out. Also, they are attached firmly to the railings, i couldn't blow them away, i tried pulling out a few the white parts comes off easily, but the stalk(if i can call it so) is hard to pull out, by hard i mean, there is some, more than expected resistance, but doable. A bit slippery also. 2. Relevant equations ---. 3. The attempt at a solution I don't know where to start. i do know about bacteria that can grow on metal- Magnetotactic bacteria. But nothing about these kind. Thank you in advance.