diff --git a/notebooks/1b--Introduction.ipynb b/notebooks/1b--Introduction.ipynb
index 1de2b483b435486b564eb734ac82671c01c688d4..f10683a6aaffb206ddf3b509d21bd41b36547d11 100644
--- a/notebooks/1b--Introduction.ipynb
+++ b/notebooks/1b--Introduction.ipynb
@@ -29,7 +29,7 @@
     "* Efficiency with respect to development effort:  \n",
     "  $\\rightarrow$ Python helps you to get \"things done\" quickly and focus on science.\n",
     "* Efficiency with respect to hardware utilization:  \n",
-    "  $\\rightarrow$ Python-based codes may perform well if implemented correctly.\n",
+    "  $\\rightarrow$ Python-based codes may perform well if implemented properly.\n",
     "* Using Python may achieve a good overall efficiency for small- to medium-scale codes\n",
     "* And finally ... Python is already there, so we have do deal with it!"
    ]
@@ -101,7 +101,7 @@
     "* Refresher of Python and the Python Ecosystem\n",
     "* Scientific Computing with Python: NumPy and SciPy\n",
     "* Performance: Cython, Numba, C/Fortran interfacing\n",
-    "* Parallelism: multiprocessing, mpi4py\n",
+    "* Parallelism: multithreading, multiprocessing, mpi4py\n",
     "* Software Engineering"
    ]
   },
diff --git a/notebooks/1c--Python_Refresher.ipynb b/notebooks/1c--Python_Refresher.ipynb
index 0e937e5f092d68ad58ce1859013ba23e56187769..05b09c6c2e4f5506eb758de2b5b9fb2de5831eec 100644
--- a/notebooks/1c--Python_Refresher.ipynb
+++ b/notebooks/1c--Python_Refresher.ipynb
@@ -754,7 +754,7 @@
    "metadata": {
     "scrolled": true,
     "slideshow": {
-     "slide_type": "subslide"
+     "slide_type": "fragment"
     }
    },
    "outputs": [