english: If we think about the scale of size, start with an everyday object like the tennis ball, and just go down orders of magnitude in size -- from the eye of a needle down to a cell, down to a bacterium, down to an enzyme -- you eventually reach the nano-world.
non_english: Ako razmišljamo o lestvici, veličini, počnite od običnog predmeta  kao što je teniska loptica i samo krenite naniže ka manjim veličinama - od iglenih ušiju do ćelije, pa do bakterije, pa do enzima - na kraju dolazite do nanosveta.