@misc{indiciae2b3e83f613cd,
  title = {How did cooperative behavior evolve?},
  author = {Elizabeth Pennisi},
  year = {2005},
  doi = {10.1126/science.309.5731.93},
  url = {https://pubmed.ncbi.nlm.nih.gov/15994539/},
  note = {Source identifier: 15994539}
}