A quantum internet supports numerous applications, enabled by quantum entanglement. Entropy can be used as a measure of quantum entanglement. EPR refers to quantum entanglement (EPR paradox). They made a solution based on the quantum phenomenon of entanglement. Spin squeezed states are good candidates for enhancing precision measurements using quantum entanglement. Homodyne detection was one of the key techniques in demonstrating quantum entanglement. Bell carried the analysis of quantum entanglement much further. Microscopically, topological orders correspond to patterns of long-range quantum entanglement. They introduced coherence monotones analogous to the entanglement monotones. The correct ionization energy can be calculated only by consideration of electron entanglement. Induced gravity can emerge from the entanglement first law. Accordingly, no hydrodynamic analog of entanglement has been developed. Abandoned or lost nets and lines cause mortality through ingestion or entanglement. Bustards are also occasionally killed by collisions with automobiles or by entanglement in wires. Tuna seines are particularly problematic for entanglement by dolphins.