diff --git a/.DS_Store b/.DS_Store
index 32fce50..8314adf 100644
Binary files a/.DS_Store and b/.DS_Store differ
diff --git a/unit06_trust_dig_cert/.DS_Store b/unit06_trust_dig_cert/.DS_Store
index 178e9ce..0caeee4 100644
Binary files a/unit06_trust_dig_cert/.DS_Store and b/unit06_trust_dig_cert/.DS_Store differ
diff --git a/unit07_tunnelling/lecture/unit07_tunnelling.pptx b/unit07_tunnelling/lecture/unit07_tunnelling.pptx
index c2dc818..d9e9d90 100644
Binary files a/unit07_tunnelling/lecture/unit07_tunnelling.pptx and b/unit07_tunnelling/lecture/unit07_tunnelling.pptx differ
diff --git a/z_assessments/.DS_Store b/z_assessments/.DS_Store
index 7d446b8..9be4588 100644
Binary files a/z_assessments/.DS_Store and b/z_assessments/.DS_Store differ
diff --git a/z_assessments/test01/.DS_Store b/z_assessments/test01/.DS_Store
index a202c70..ac3f012 100644
Binary files a/z_assessments/test01/.DS_Store and b/z_assessments/test01/.DS_Store differ