| The bacteria pneumococcus, with more than 90 serotypes, is a common pathogen with many unknowns. |
| Grexit would present many unknowns because the euro zone was never designed to be undone. |
| Oil dispersants were applied only as a test because there were too many unknowns about their effect on the environment. |
| Apparently, participating in unscheduled photo calls with unknowns isn't her idea of how people should behave in showbiz. |
| The degree of F-actin plasticity has remained one of the main unknowns of cell migration mechanics. |
| The unknowns have got a full-fledged identity during past 13 years of armed activities in Kashmir. |
