This is an alga, Closterium and it holds some tiny barium crystals at the tip of its cell that vibrate continuously because they are bombarded by the water molecules that surround them! This is called the Brownian motion! Did you know that you can zoom in on videos on Instagram? Just pinch using two fingers to see the crystals better! . I love seeing this because it's basically seeing the molecules moving nonstop and hitting the crystals. The molecules move because they have energy. The crystals