troubleshoot ampersand replacement #1031

Job	Run time
run_notebook (hw_2.ipynb)	1m 2s
run_notebook (hw_0.ipynb)	59s
run_notebook (lecture_1_demo_solution.ipynb)	1m 6s
run_notebook (lecture_1.ipynb)	1m 7s
run_notebook (lecture_1_exercise_solution.ipynb)	1m 2s
run_notebook (lecture_1_exercise.ipynb)	1m 3s
run_notebook (lecture_2.ipynb)	1m 15s
run_notebook (lecture_0.ipynb)	57s
run_notebook (lecture_2_exercise.ipynb)	1m 2s
run_notebook (lecture_2_exercise_2_solution.ipynb)	1m 5s
run_notebook (lecture_4_demo_solution.ipynb)	1m 20s
run_notebook (lecture_3_exercise_solution.ipynb)	1m 5s
run_notebook (lecture_3.ipynb)	1m 6s
run_notebook (lecture_3_demo_solution.ipynb)	1m 1s
run_notebook (brackets.ipynb)	57s
run_notebook (lecture_5_exercise_solution.ipynb)	57s
run_notebook (lecture_4.ipynb)	57s
run_notebook (lecture_5.ipynb)	1m 3s
run_notebook (hw_3.ipynb)	54s
run_notebook (lecture_6.ipynb)	56s
run_notebook (curve.ipynb)	55s
run_notebook (extras/pandas_crash_course.ipynb)	1m 0s
	22m 49s

Provide feedback