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What are sources of error in a science lab?

We had a lab in chemistry yesterday on molar enthalpys of different substances. One questions under the analysis was "list some possible sources of error." My chem teacher said sources of error had nothing to do with incorrect measurments or anything...What could be possible sources of error then?
Shawn:

cross contamination.

Gbob_north:

Inconsistent test subjects (spoiled soy agar and the like), irregular temperatures, and as Dancer said cross contamination.

Tangent Bill:

Scientists make a huge error when they try to force the scientific data into their particular worldview, rather than objectively following the evidence wherever it leads them. I am convinced that the scientific evidence affirms biblical creation and refutes naturalistic evolution.

Dingo:

sun light

Gbob_north:

Good one.

A2z:

Yes.

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