diff --git a/CoreDataBooks/Classes/CoreDataBooksAppDelegate.m b/CoreDataBooks/Classes/CoreDataBooksAppDelegate.m
index 2e13162..5d2bf10 100644
--- a/CoreDataBooks/Classes/CoreDataBooksAppDelegate.m
+++ b/CoreDataBooks/Classes/CoreDataBooksAppDelegate.m
@@ -1,8 +1,8 @@

 /*
-     File: CoreDataBooksAppDelegate.m
+ File: CoreDataBooksAppDelegate.m
  Abstract: Application delegate to set up the Core Data stack and configure the first view and navigation controllers.
-  Version: 2
+ Version: 2

  Disclaimer: IMPORTANT:  This Apple software is supplied to you by Apple
  Inc. ("Apple") in consideration of your agreement to the following
@@ -49,176 +49,35 @@
 #import "CoreDataBooksAppDelegate.h"
 #import "RootViewController.h"

-
-@interface CoreDataBooksAppDelegate ()
-
-@property (nonatomic, strong, readonly) NSManagedObjectModel *managedObjectModel;
-@property (nonatomic, strong, readonly) NSManagedObjectContext *managedObjectContext;
-@property (nonatomic, strong, readonly) NSPersistentStoreCoordinator *persistentStoreCoordinator;
-
-- (NSURL *)applicationDocumentsDirectory;
-- (void)saveContext;
-
-@end
-
-
+#import "TXMainThreadMOC.h"

 @implementation CoreDataBooksAppDelegate

 @synthesize window=_window;
-@synthesize managedObjectModel=_managedObjectModel, managedObjectContext=_managedObjectContext, persistentStoreCoordinator=_persistentStoreCoordinator;


 #pragma mark -
 #pragma mark Application lifecycle

-- (void)applicationDidFinishLaunching:(UIApplication *)application
-{
-    UINavigationController *navigationController = (UINavigationController *)self.window.rootViewController;
-    RootViewController *rootViewController = (RootViewController *)[[navigationController viewControllers] objectAtIndex:0];
-    rootViewController.managedObjectContext = self.managedObjectContext;
+- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions{
+  return YES;
 }

-
 - (void)applicationWillTerminate:(UIApplication *)application
 {
-    [self saveContext];
+  [MainThreadMOC saveContext];
 }


 - (void)applicationWillResignActive:(UIApplication *)application
 {
-    [self saveContext];
+  [MainThreadMOC saveContext];
 }


 - (void)applicationDidEnterBackground:(UIApplication *)application
 {
-    [self saveContext];
-}
-
-
-- (void)saveContext
-{
-    NSError *error;
-    if (_managedObjectContext != nil) {
-        if ([_managedObjectContext hasChanges] && ![_managedObjectContext save:&error]) {
-            /*
-             Replace this implementation with code to handle the error appropriately.
-     
-             abort() causes the application to generate a crash log and terminate. You should not use this function in a shipping application, although it may be useful during development. 
-             */
-            NSLog(@"Unresolved error %@, %@", error, [error userInfo]);
-            abort();
-        } 
-    }
-}
-
-
-#pragma mark -
-#pragma mark Core Data stack
-
-/*
- Returns the managed object context for the application.
- If the context doesn't already exist, it is created and bound to the persistent store coordinator for the application.
- */
-- (NSManagedObjectContext *) managedObjectContext
-{
-    if (_managedObjectContext != nil) {
-        return _managedObjectContext;
-    }
-
-    NSPersistentStoreCoordinator *coordinator = [self persistentStoreCoordinator];
-    if (coordinator != nil) {
-        _managedObjectContext = [[NSManagedObjectContext alloc] initWithConcurrencyType:NSMainQueueConcurrencyType];
-        [_managedObjectContext setPersistentStoreCoordinator: coordinator];
-    }
-    return _managedObjectContext;
-}
-
-
-// Returns the managed object model for the application.
-// If the model doesn't already exist, it is created from the application's model.
-- (NSManagedObjectModel *)managedObjectModel
-{
-    if (_managedObjectModel != nil) {
-        return _managedObjectModel;
-    }
-    NSURL *modelURL = [[NSBundle mainBundle] URLForResource:@"CoreDataBooks" withExtension:@"momd"];
-    _managedObjectModel = [[NSManagedObjectModel alloc] initWithContentsOfURL:modelURL];
-    return _managedObjectModel;
-}
-
-
-/*
- Returns the persistent store coordinator for the application.
- If the coordinator doesn't already exist, it is created and the application's store added to it.
- */
-- (NSPersistentStoreCoordinator *)persistentStoreCoordinator
-{
-    if (_persistentStoreCoordinator != nil) {
-        return _persistentStoreCoordinator;
-    }
-
-    NSURL *storeURL = [[self applicationDocumentsDirectory] URLByAppendingPathComponent:@"CoreDataBooks.CDBStore"];
-
-    /*
-     Set up the store.
-     For the sake of illustration, provide a pre-populated default store.
-     */
-    NSFileManager *fileManager = [NSFileManager defaultManager];
-    // If the expected store doesn't exist, copy the default store.
-    if (![fileManager fileExistsAtPath:[storeURL path]]) {
-        NSURL *defaultStoreURL = [[NSBundle mainBundle] URLForResource:@"CoreDataBooks" withExtension:@"CDBStore"];
-        if (defaultStoreURL) {
-            [fileManager copyItemAtURL:defaultStoreURL toURL:storeURL error:NULL];
-        }
-    }
-
-    NSDictionary *options = [NSDictionary dictionaryWithObjectsAndKeys:[NSNumber numberWithBool:YES], NSMigratePersistentStoresAutomaticallyOption, [NSNumber numberWithBool:YES], NSInferMappingModelAutomaticallyOption, nil];
-    _persistentStoreCoordinator = [[NSPersistentStoreCoordinator alloc] initWithManagedObjectModel: [self managedObjectModel]];
-
-    NSError *error;
-    if (![_persistentStoreCoordinator addPersistentStoreWithType:NSSQLiteStoreType configuration:nil URL:storeURL options:options error:&error]) {
-        /*
-         Replace this implementation with code to handle the error appropriately.
-         
-         abort() causes the application to generate a crash log and terminate. You should not use this function in a shipping application, although it may be useful during development. 
-         
-         Typical reasons for an error here include:
-         * The persistent store is not accessible;
-         * The schema for the persistent store is incompatible with current managed object model.
-         Check the error message to determine what the actual problem was.
-         
-         
-         If the persistent store is not accessible, there is typically something wrong with the file path. Often, a file URL is pointing into the application's resources directory instead of a writeable directory.
-         
-         If you encounter schema incompatibility errors during development, you can reduce their frequency by:
-         * Simply deleting the existing store:
-         [[NSFileManager defaultManager] removeItemAtURL:storeURL error:nil]
-         
-         * Performing automatic lightweight migration by passing the following dictionary as the options parameter:
-         @{NSMigratePersistentStoresAutomaticallyOption:@YES, NSInferMappingModelAutomaticallyOption:@YES}
-         
-         Lightweight migration will only work for a limited set of schema changes; consult "Core Data Model Versioning and Data Migration Programming Guide" for details.
-         
-         */
-        NSLog(@"Unresolved error %@, %@", error, [error userInfo]);
-        abort();
-    }
-
-    return _persistentStoreCoordinator;
-}
-
-
-#pragma mark -
-#pragma mark Application's documents directory
-
-// Returns the URL to the application's Documents directory.
-- (NSURL *)applicationDocumentsDirectory
-{
-    return [[[NSFileManager defaultManager] URLsForDirectory:NSDocumentDirectory inDomains:NSUserDomainMask] lastObject];
+  [MainThreadMOC saveContext];
 }

-
 @end