diff --git a/Converter/converter.py b/Converter/converter.py
index c21fb90b..8c2ca6ea 100644
--- a/Converter/converter.py
+++ b/Converter/converter.py
@@ -1,4 +1,4 @@
-from converter_values import *  # import required files
+from converter_values import options, CATEGORIES
 
 def main():
     print(options["help"])  # prints help menu
@@ -6,14 +6,14 @@ def main():
 
     while res.lower() != "q":  # program loop
         try:
-            res = res.strip().split(" ")
+            tokens = res.strip().split(" ")
 
-            if len(res) == 1:
-                display_help(res[0])  # display help menu
-            elif len(res) == 4:
-                perform_conversion(res)  # perform unit conversion
+            if len(tokens) == 1:
+                display_help(tokens[0])  # display help menu
+            elif len(tokens) == 4:
+                perform_conversion(tokens)  # perform unit conversion
             else:
-                print("Invalid command")
+                print("Invalid command. Format: <Category> <Unit> <Value> <TargetUnits>")
 
         except Exception as e:
             print("Error:", e)
@@ -22,15 +22,44 @@ def main():
 
 def display_help(command):
     """Display help menu."""
-    print(options[command])
+    if command in options:
+        print(options[command])
+    else:
+        print(f"Unknown command '{command}'. Type 'help' or 'symbols'.")
 
 def perform_conversion(res):
-    """Perform unit conversion."""
-    for i in res[3].split(','):
-        value = round(eval("{} * {}['{}'] / {}['{}']".format(res[2], res[0], i, res[0], res[1])), 6)  # calculating
-        print("{} \t : {}".format(i, value))  # displaying
+    """Perform unit conversion cleanly without unsafe eval."""
+    category_code = res[0].upper()
+    src_unit = res[1]
+    
+    if category_code not in CATEGORIES:
+        print(f"Invalid category '{res[0]}'. Valid categories: {', '.join(CATEGORIES.keys())}")
+        return
+
+    unit_dict = CATEGORIES[category_code]
+    
+    if src_unit not in unit_dict:
+        print(f"Invalid source unit '{src_unit}' for category '{category_code}'.")
+        return
+
+    try:
+        raw_val = float(res[2])
+    except ValueError:
+        print(f"Invalid numeric value '{res[2]}'.")
+        return
+
+    target_units = [u.strip() for u in res[3].split(',')]
+    for target in target_units:
+        if target not in unit_dict:
+            print(f"Invalid target unit '{target}' for category '{category_code}'.")
+            continue
+        
+        # Calculation: val * unit_dict[target] / unit_dict[src_unit]
+        calc_value = round((raw_val * unit_dict[target]) / unit_dict[src_unit], 6)
+        print("{} \t : {}".format(target, calc_value))
 
 if __name__ == "__main__":
     main()
 
 
+
diff --git a/Converter/converter_values.py b/Converter/converter_values.py
index 3cc9c104..976619eb 100644
--- a/Converter/converter_values.py
+++ b/Converter/converter_values.py
@@ -7,7 +7,7 @@
 inch : in
 kilometer : km
 meter : m
-micrometer ; um
+micrometer : um
 mile : mi
 millimeter : mm
 nanometer : nm
@@ -21,7 +21,7 @@
 sq inch : in2
 sq km : km2
 sq m : m2
-sq mile : mi
+sq mile : mi2
 sq yard : yd2
 
 VOLUME : V ----------------------------------------------------------------
@@ -115,3 +115,12 @@
     "min":1440  ,
     "sec":86400 }
 
+CATEGORIES = {
+    "L": L,
+    "A": A,
+    "V": V,
+    "M": M,
+    "T": T
+}
+
+
diff --git a/Download Audio/Download Audio.py b/Download Audio/Download Audio.py
index 16826717..c0be2997 100644
--- a/Download Audio/Download Audio.py	
+++ b/Download Audio/Download Audio.py	
@@ -1,23 +1,63 @@
 import os
 import pytube
-from moviepy.editor import *
+from moviepy.editor import AudioFileClip
 
-# Define the YouTube video URL
-youtube_url = "https://www.youtube.com/watch?v=E6eKvji_BoE"
+def main():
+    print("=== YouTube Audio Downloader ===")
+    
+    # Get YouTube URL from user
+    youtube_url = input("Enter YouTube video URL: ").strip()
+    if not youtube_url:
+        print("Error: URL cannot be empty.")
+        return
 
-# Create a PyTube object and get the audio stream
-yt = pytube.YouTube(youtube_url)
-audio_stream = yt.streams.filter(only_audio=True).first()
+    # Get output directory
+    output_dir = input("Enter save directory path (press Enter for current directory): ").strip()
+    if not output_dir:
+        output_dir = "."
+    
+    if not os.path.exists(output_dir):
+        try:
+            os.makedirs(output_dir)
+            print(f"Created directory: {output_dir}")
+        except Exception as e:
+            print(f"Error creating directory '{output_dir}': {e}")
+            return
 
-# Download the audio stream as a temporary file
-temp_file = audio_stream.download()
+    # Get file name
+    file_name = input("Enter output filename (e.g. audio.mp3 or press Enter for default 'audio.mp3'): ").strip()
+    if not file_name:
+        file_name = "audio.mp3"
+    elif not file_name.endswith(".mp3"):
+        file_name += ".mp3"
 
-# Convert the audio stream to an MP3 file using MoviePy
-audio_clip = AudioFileClip(temp_file)
-mp3_file = os.path.join("Give Your own path", "Name.mp3")
-audio_clip.write_audiofile(mp3_file)
+    target_path = os.path.join(output_dir, file_name)
 
-# Clean up the temporary file
-os.remove(temp_file)
+    try:
+        print("Fetching video streams...")
+        yt = pytube.YouTube(youtube_url)
+        audio_stream = yt.streams.filter(only_audio=True).first()
 
-print("Audio extracted and saved as MP3 file to", mp3_file)
\ No newline at end of file
+        if not audio_stream:
+            print("Error: No audio stream found for this video.")
+            return
+
+        print("Downloading audio stream...")
+        temp_file = audio_stream.download()
+
+        print("Converting audio to MP3...")
+        audio_clip = AudioFileClip(temp_file)
+        audio_clip.write_audiofile(target_path)
+        audio_clip.close()
+
+        # Clean up temporary file
+        if os.path.exists(temp_file):
+            os.remove(temp_file)
+
+        print(f"\nSuccess! Audio saved as MP3 file to: {os.path.abspath(target_path)}")
+
+    except Exception as e:
+        print(f"\nAn error occurred while processing the video: {e}")
+
+if __name__ == "__main__":
+    main()
\ No newline at end of file
diff --git a/Download Audio/README.md b/Download Audio/README.md
index 7f4a56b8..1c92acff 100644
--- a/Download Audio/README.md	
+++ b/Download Audio/README.md	
@@ -24,9 +24,13 @@ This script is written in Python language. So make sure you have python installe
 3. write "pip install pytube" 
 ## 🌟 How to run
 <!--Remove the below lines and add yours -->
-- Open the Download Audio.py script
-- Add your own youtube video url instead of the default one in line 6.
-- In Line 17, in the path section write your own path and in name section write the name You want your file to have.
+- Run the `Download Audio.py` script:
+  ```bash
+  python "Download Audio.py"
+  ```
+- Enter the YouTube URL when prompted.
+- Enter the destination folder path (or press Enter to save in the current directory).
+- Enter your desired filename (or press Enter for default `audio.mp3`).
 
 
 ## 🤖 Author
diff --git a/NASA_Image_Extraction/Astro_Images/2022-11-25_NGC 6744: Extragalactic Close-Up.mp3 b/NASA_Image_Extraction/Astro_Images/2022-11-25_NGC 6744: Extragalactic Close-Up.mp3
deleted file mode 100644
index f5611fcf..00000000
Binary files a/NASA_Image_Extraction/Astro_Images/2022-11-25_NGC 6744: Extragalactic Close-Up.mp3 and /dev/null differ