these are larger than dust, they actually have a small "propeller" https://media.npr.org/assets/img/2021/09/23/microflier1-013bcb9dc9bbd61b03a1151d2c5492ac144f

these are larger than dust, they actually have a small "propeller" https://media.npr.org/assets/img/2021/09/23/microflier1-013bcb9dc9bbd61b03a1151d2c5492ac144fc905-s1100-c50.png https://media.npr.org/assets/img/2021/09/23/microflier1-013b... https://media.npr.org/assets/img/2021/09/23/microflier_sq-3e556954d8b0774be92d35108a4feb23ba9f250e-s1100-c50.png https://media.npr.org/assets/img/2021/09/23/microflier_sq-3e...