"continuing this analogy, one can say that the nuclear forces are like the van der Waals forces that hold these atoms together in a liquid droplet (liquid helium, neon, ...). This analogy is confirmed by the relative smallness of the nuclear forces: the binding energy of the protons and neutrons in the nucleus is of the order of 10-20 MeV - very large compared to chemical energies (electron volts), but small compared to mpc2 = 940 MeV. "
This is wrong. They are not like tentacles. The paper is a list of science concepts that students had misconception about. The central problem outlined in the paper is that these mis-formed ideas are learned in the lower grades and cared on through the students' career.
METAMIA is a free database of analogy and metaphor. Anyone can contribute or search. The subject matter can be anything. Science is popular, but poetry is encouraged. The goal is to integrate our fluid muses with the stark literalism of a relational database. Metamia is like a girdle for your muses, a cognitive girdle.